We're dividing 15315821 by 427 
We want to figure out the number of times 15315821 can be divided by 427.

Going ahead to step 1:
When dividing 1 by 427, we get 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 427

Step 2:
15 divided by 427 is 0 with a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Grab the next digit (3) from the dividend, add it to 15, then carry on: 153 / 427

Moving on to step 3:
153 divided by 427 is 0 with a remainder of 153.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 153 to get 153.
Grab the next digit (1) from the dividend, add it to 153, then carry on: 1531 / 427

Going ahead to step 4:
1531 divided by 427 is 3 with a remainder of 250.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 250 after subtracting 1281 from 1531.
Include the next digit (5) from the dividend after 250, then repeat: 2505 / 427

Let's proceed to step 5:
2505 divided by 427 is 5 with a remainder of 370.
Use 5 as the next digit of our solution. 
Result so far: 35.0
The remainder is 370 after subtracting 2135 from 2505.
Take the next digit (8) from the dividend and append it to 370, then repeat: 3708 / 427

Advancing to step 6:
The number 427 fits into 3708 8 times, leaving a remainder of 292.
Use 8 as the next digit of our solution. 
Result so far: 358.0
Subtracting 3416 from 3708 leaves us with 292.
Grab the next digit (2) from the dividend, add it to 292, then carry on: 2922 / 427

Let's proceed to step 7:
427 goes into 2922 6 times with a remainder of 360.
Use 6 as the next digit of our solution. 
Result so far: 3586.0
Subtracting 2562 from 2922 leaves us with 360.
Bring next digit (1) of the dividend behind the 360 and repeat the process: 3601 / 427

Step 8:
427 goes into 3601 8 times with a remainder of 185.
The number 8 becomes the next digit in our result. 
Result so far: 35868.0
Subtract 3416 from 3601 to get 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

On to step 9:
427 goes into 1850 4 times with a remainder of 142.
Use 4 as the next digit of our solution. 
Result so far: 35868.4
Subtract 1708 from 1850 to get 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Going ahead to step 10:
If we divide 1420 by 427, we get 3 and a remainder of 139.
Put 3 as the next digit of the answer. 
Result so far: 35868.43
Deduct 1281 from 1420 and we're left with 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

Moving on to step 11:
When dividing 1390 by 427, we get 3 with a remainder of 109.
Put 3 as the next digit of the answer. 
Result so far: 35868.433
If we subtract 1281 from 1390, we get 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

The final outcome is 35868.433, with a leftover of 0.0109.