15472189 divided by 421 
The aim is to understand the frequency of 421 in 15472189.

On to step 1:
421 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 421

Moving on to step 2:
15 divided by 421 is 0 with a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Grab the next digit (4) from the dividend, add it to 15, then carry on: 154 / 421

On to step 3:
The number 421 fits into 154 0 times, leaving a remainder of 154.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 154 and we're left with 154.
Append the next digit (7) from the dividend to 154 and continue with: 1547 / 421

Advancing to step 4:
If we divide 1547 by 421, we get 3 and a remainder of 284.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 1263 from 1547 to get 284.
Fetch the next digit (2) from the dividend, attach it to 284 and continue: 2842 / 421

Going ahead to step 5:
421 goes into 2842 6 times with a remainder of 316.
The number 6 becomes the next digit in our result. 
Result so far: 36.0
Deduct 2526 from 2842 and we're left with 316.
Append the next digit (1) from the dividend to 316 and continue with: 3161 / 421

Let's proceed to step 6:
3161 divided by 421 is 7 with a remainder of 214.
The number 7 becomes the next digit in our result. 
Result so far: 367.0
If we take 2947 away from 3161, we end up with 214.
Include the next digit (8) from the dividend after 214, then repeat: 2148 / 421

Moving on to step 7:
2148 divided by 421 is 5 with a remainder of 43.
The next digit of our result is 5. 
Result so far: 3675.0
If we subtract 2105 from 2148, we get 43.
Take the next digit (9) from the dividend and append it to 43, then repeat: 439 / 421

Let's proceed to step 8:
421 goes into 439 1 times with a remainder of 18.
Write down 1 as next digit of the result. 
Result so far: 36751.0
Subtracting 421 from 439 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 9:
If we divide 180 by 421, we get 0 and a remainder of 180.
Put 0 as the next digit of the answer. 
Result so far: 36751.0
The remainder is 180 after subtracting 0 from 180.
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 10:
421 can be fit into 1800 4 times, resulting in a remainder of 116.
Record the quotient 4 as the next digit in the result. 
Result so far: 36751.04
The remainder is 116 after subtracting 1684 from 1800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

On to step 11:
When dividing 1160 by 421, we get 2 with a remainder of 318.
Write down 2 as next digit of the result. 
Result so far: 36751.042
If we take 842 away from 1160, we end up with 318.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

Step 12:
If we divide 3180 by 421, we get 7 and a remainder of 233.
The next digit of our result is 7. 
Result so far: 36751.0427
Deduct 2947 from 3180 and we're left with 233.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2330, and continue the process.

Advancing to step 13:
421 goes into 2330 5 times with a remainder of 225.
Write down 5 as next digit of the result. 
Result so far: 36751.04275
If we subtract 2105 from 2330, we get 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Step 14:
2250 divided by 421 is 5 with a remainder of 145.
The next digit of our result is 5. 
Result so far: 36751.042755
If we subtract 2105 from 2250, we get 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

After the division, we end up with 36751.042755 and a remainder of 1.45e-05.