We look at the division of 15352128 by 420 
Let's see how many times 420 fits into 15352128.

Step 1:
When dividing 1 by 420, we get 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 420

Going ahead to step 2:
420 can be fit into 15 0 times, resulting in a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Bring next digit (3) of the dividend behind the 15 and repeat the process: 153 / 420

Advancing to step 3:
The number 420 fits into 153 0 times, leaving a remainder of 153.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 153, we end up with 153.
Bring next digit (5) of the dividend behind the 153 and repeat the process: 1535 / 420

Let's proceed to step 4:
If we divide 1535 by 420, we get 3 and a remainder of 275.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 1260 from 1535 leaves us with 275.
Take the next digit (2) from the dividend and append it to 275, then repeat: 2752 / 420

Moving on to step 5:
2752 divided by 420 is 6 with a remainder of 232.
The next digit of our result is 6. 
Result so far: 36.0
The remainder is 232 after subtracting 2520 from 2752.
Include the next digit (1) from the dividend after 232, then repeat: 2321 / 420

Step 6:
If we divide 2321 by 420, we get 5 and a remainder of 221.
Use 5 as the next digit of our solution. 
Result so far: 365.0
Subtracting 2100 from 2321 leaves us with 221.
Bring next digit (2) of the dividend behind the 221 and repeat the process: 2212 / 420

On to step 7:
If we divide 2212 by 420, we get 5 and a remainder of 112.
The number 5 becomes the next digit in our result. 
Result so far: 3655.0
The remainder is 112 after subtracting 2100 from 2212.
Bring next digit (8) of the dividend behind the 112 and repeat the process: 1128 / 420

Advancing to step 8:
When dividing 1128 by 420, we get 2 with a remainder of 288.
The number 2 becomes the next digit in our result. 
Result so far: 36552.0
If we subtract 840 from 1128, we get 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Let's proceed to step 9:
If we divide 2880 by 420, we get 6 and a remainder of 360.
Put 6 as the next digit of the answer. 
Result so far: 36552.6
The remainder is 360 after subtracting 2520 from 2880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Step 10:
The number 420 fits into 3600 8 times, leaving a remainder of 240.
Record the quotient 8 as the next digit in the result. 
Result so far: 36552.68
Subtracting 3360 from 3600 leaves us with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Advancing to step 11:
420 can be fit into 2400 5 times, resulting in a remainder of 300.
Use 5 as the next digit of our solution. 
Result so far: 36552.685
Subtracting 2100 from 2400 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Let's proceed to step 12:
420 can be fit into 3000 7 times, resulting in a remainder of 60.
The number 7 becomes the next digit in our result. 
Result so far: 36552.6857
Subtracting 2940 from 3000 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 13:
420 goes into 600 1 times with a remainder of 180.
The number 1 becomes the next digit in our result. 
Result so far: 36552.68571
The remainder is 180 after subtracting 420 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Going ahead to step 14:
420 can be fit into 1800 4 times, resulting in a remainder of 120.
The next digit of our result is 4. 
Result so far: 36552.685714
The remainder is 120 after subtracting 1680 from 1800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Step 15:
The number 420 fits into 1200 2 times, leaving a remainder of 360.
Use 2 as the next digit of our solution. 
Result so far: 36552.6857142
Deduct 840 from 1200 and we're left with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Going ahead to step 16:
The number 420 fits into 3600 8 times, leaving a remainder of 240.
The next digit of our result is 8. 
Result so far: 36552.68571428
Deduct 3360 from 3600 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

The final outcome is 36552.68571428, with a leftover of 2.4e-07.