We're dividing 15987284 by 123 
Our goal is to divide 15987284 by 123.

Moving on to step 1:
123 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 123

Step 2:
123 can be fit into 15 0 times, resulting in a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Bring next digit (9) of the dividend behind the 15 and repeat the process: 159 / 123

Let's proceed to step 3:
When dividing 159 by 123, we get 1 with a remainder of 36.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 123 from 159 to get 36.
Append the next digit (8) from the dividend to 36 and continue with: 368 / 123

On to step 4:
When dividing 368 by 123, we get 2 with a remainder of 122.
Write down 2 as next digit of the result. 
Result so far: 12.0
If we subtract 246 from 368, we get 122.
Grab the next digit (7) from the dividend, add it to 122, then carry on: 1227 / 123

Let's proceed to step 5:
123 can be fit into 1227 9 times, resulting in a remainder of 120.
Record the quotient 9 as the next digit in the result. 
Result so far: 129.0
Subtracting 1107 from 1227 leaves us with 120.
Include the next digit (2) from the dividend after 120, then repeat: 1202 / 123

Going ahead to step 6:
1202 divided by 123 is 9 with a remainder of 95.
Use 9 as the next digit of our solution. 
Result so far: 1299.0
If we subtract 1107 from 1202, we get 95.
Include the next digit (8) from the dividend after 95, then repeat: 958 / 123

Step 7:
The number 123 fits into 958 7 times, leaving a remainder of 97.
The next digit of our result is 7. 
Result so far: 12997.0
If we take 861 away from 958, we end up with 97.
Include the next digit (4) from the dividend after 97, then repeat: 974 / 123

Step 8:
The number 123 fits into 974 7 times, leaving a remainder of 113.
The number 7 becomes the next digit in our result. 
Result so far: 129977.0
Deduct 861 from 974 and we're left with 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1130, and continue the process.

Moving on to step 9:
123 goes into 1130 9 times with a remainder of 23.
The next digit of our result is 9. 
Result so far: 129977.9
If we subtract 1107 from 1130, we get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

On to step 10:
If we divide 230 by 123, we get 1 and a remainder of 107.
The number 1 becomes the next digit in our result. 
Result so far: 129977.91
If we subtract 123 from 230, we get 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

Let's proceed to step 11:
123 can be fit into 1070 8 times, resulting in a remainder of 86.
Record the quotient 8 as the next digit in the result. 
Result so far: 129977.918
Subtracting 984 from 1070 leaves us with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

On to step 12:
If we divide 860 by 123, we get 6 and a remainder of 122.
Record the quotient 6 as the next digit in the result. 
Result so far: 129977.9186
If we subtract 738 from 860, we get 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

Moving on to step 13:
When dividing 1220 by 123, we get 9 with a remainder of 113.
The number 9 becomes the next digit in our result. 
Result so far: 129977.91869
Subtract 1107 from 1220 to get 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1130, and continue the process.

Step 14:
When dividing 1130 by 123, we get 9 with a remainder of 23.
The next digit of our result is 9. 
Result so far: 129977.918699
Subtracting 1107 from 1130 leaves us with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

In conclusion, the division gives 129977.918699 with a balance of 2.3e-06.