We're dividing 15166287 by 400 
Let's see how many times 400 fits into 15166287.

Moving on to step 1:
The number 400 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 400

Step 2:
The number 400 fits into 15 0 times, leaving a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Grab the next digit (1) from the dividend, add it to 15, then carry on: 151 / 400

On to step 3:
If we divide 151 by 400, we get 0 and a remainder of 151.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 151 after subtracting 0 from 151.
Include the next digit (6) from the dividend after 151, then repeat: 1516 / 400

Going ahead to step 4:
When dividing 1516 by 400, we get 3 with a remainder of 316.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtract 1200 from 1516 to get 316.
Append the next digit (6) from the dividend to 316 and continue with: 3166 / 400

Step 5:
If we divide 3166 by 400, we get 7 and a remainder of 366.
Put 7 as the next digit of the answer. 
Result so far: 37.0
Subtracting 2800 from 3166 leaves us with 366.
Bring next digit (2) of the dividend behind the 366 and repeat the process: 3662 / 400

Advancing to step 6:
3662 divided by 400 is 9 with a remainder of 62.
Use 9 as the next digit of our solution. 
Result so far: 379.0
If we take 3600 away from 3662, we end up with 62.
Include the next digit (8) from the dividend after 62, then repeat: 628 / 400

Moving on to step 7:
628 divided by 400 is 1 with a remainder of 228.
The next digit of our result is 1. 
Result so far: 3791.0
The remainder is 228 after subtracting 400 from 628.
Take the next digit (7) from the dividend and append it to 228, then repeat: 2287 / 400

Let's proceed to step 8:
400 can be fit into 2287 5 times, resulting in a remainder of 287.
The next digit of our result is 5. 
Result so far: 37915.0
Subtracting 2000 from 2287 leaves us with 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

Let's proceed to step 9:
The number 400 fits into 2870 7 times, leaving a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 37915.7
Subtracting 2800 from 2870 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 10:
400 goes into 700 1 times with a remainder of 300.
The next digit of our result is 1. 
Result so far: 37915.71
Deduct 400 from 700 and we're left 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.

Going ahead to step 11:
If we divide 3000 by 400, we get 7 and a remainder of 200.
The next digit of our result is 7. 
Result so far: 37915.717
The remainder is 200 after subtracting 2800 from 3000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Step 12:
400 goes into 2000 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 37915.7175
Subtracting 2000 from 2000 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 13:
400 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 37915.7175
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 14:
If we divide 0 by 400, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 37915.7175
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 37915.7175 and a remainder of 0.0.