39929157 ÷ 915 
Our goal is to divide 39929157 by 915.

Advancing to step 1:
The number 915 fits into 3 0 times, leaving a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 915

Let's proceed to step 2:
If we divide 39 by 915, we get 0 and a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 39, we end up with 39.
Grab the next digit (9) from the dividend, add it to 39, then carry on: 399 / 915

Step 3:
If we divide 399 by 915, we get 0 and a remainder of 399.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 399, we get 399.
Fetch the next digit (2) from the dividend, attach it to 399 and continue: 3992 / 915

Moving on to step 4:
915 goes into 3992 4 times with a remainder of 332.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 3660 from 3992 to get 332.
Bring next digit (9) of the dividend behind the 332 and repeat the process: 3329 / 915

Going ahead to step 5:
When dividing 3329 by 915, we get 3 with a remainder of 584.
Record the quotient 3 as the next digit in the result. 
Result so far: 43.0
Subtracting 2745 from 3329 leaves us with 584.
Include the next digit (1) from the dividend after 584, then repeat: 5841 / 915

On to step 6:
5841 divided by 915 is 6 with a remainder of 351.
The number 6 becomes the next digit in our result. 
Result so far: 436.0
If we take 5490 away from 5841, we end up with 351.
Take the next digit (5) from the dividend and append it to 351, then repeat: 3515 / 915

Moving on to step 7:
If we divide 3515 by 915, we get 3 and a remainder of 770.
The number 3 becomes the next digit in our result. 
Result so far: 4363.0
If we take 2745 away from 3515, we end up with 770.
Include the next digit (7) from the dividend after 770, then repeat: 7707 / 915

Step 8:
915 can be fit into 7707 8 times, resulting in a remainder of 387.
Write down 8 as next digit of the result. 
Result so far: 43638.0
If we take 7320 away from 7707, we end up with 387.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3870, and continue the process.

Advancing to step 9:
915 can be fit into 3870 4 times, resulting in a remainder of 210.
The next digit of our result is 4. 
Result so far: 43638.4
Deduct 3660 from 3870 and we're left with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Going ahead to step 10:
If we divide 2100 by 915, we get 2 and a remainder of 270.
Put 2 as the next digit of the answer. 
Result so far: 43638.42
The remainder is 270 after subtracting 1830 from 2100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Going ahead to step 11:
When dividing 2700 by 915, we get 2 with a remainder of 870.
Record the quotient 2 as the next digit in the result. 
Result so far: 43638.422
Deduct 1830 from 2700 and we're left with 870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8700, and continue the process.

The final outcome is 43638.422, with a leftover of 0.087.