We're dividing 15573799 by 126 
We're looking to find how many times 126 goes into 15573799.

Advancing to step 1:
The number 126 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 126

Moving on to step 2:
When dividing 15 by 126, we get 0 with a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Fetch the next digit (5) from the dividend, attach it to 15 and continue: 155 / 126

Going ahead to step 3:
If we divide 155 by 126, we get 1 and a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 29 after subtracting 126 from 155.
Bring next digit (7) of the dividend behind the 29 and repeat the process: 297 / 126

Advancing to step 4:
When dividing 297 by 126, we get 2 with a remainder of 45.
Write down 2 as next digit of the result. 
Result so far: 12.0
Subtract 252 from 297 to get 45.
Grab the next digit (3) from the dividend, add it to 45, then carry on: 453 / 126

Step 5:
If we divide 453 by 126, we get 3 and a remainder of 75.
Put 3 as the next digit of the answer. 
Result so far: 123.0
If we take 378 away from 453, we end up with 75.
Grab the next digit (7) from the dividend, add it to 75, then carry on: 757 / 126

Let's proceed to step 6:
126 can be fit into 757 6 times, resulting in a remainder of 1.
The next digit of our result is 6. 
Result so far: 1236.0
The remainder is 1 after subtracting 756 from 757.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 126

Moving on to step 7:
When dividing 19 by 126, we get 0 with a remainder of 19.
The next digit of our result is 0. 
Result so far: 12360.0
Subtract 0 from 19 to get 19.
Append the next digit (9) from the dividend to 19 and continue with: 199 / 126

Going ahead to step 8:
126 can be fit into 199 1 times, resulting in a remainder of 73.
Write down 1 as next digit of the result. 
Result so far: 123601.0
Subtract 126 from 199 to get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Let's proceed to step 9:
If we divide 730 by 126, we get 5 and a remainder of 100.
Put 5 as the next digit of the answer. 
Result so far: 123601.5
Deduct 630 from 730 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 10:
1000 divided by 126 is 7 with a remainder of 118.
Record the quotient 7 as the next digit in the result. 
Result so far: 123601.57
Deduct 882 from 1000 and we're left with 118.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

Going ahead to step 11:
126 can be fit into 1180 9 times, resulting in a remainder of 46.
Record the quotient 9 as the next digit in the result. 
Result so far: 123601.579
The remainder is 46 after subtracting 1134 from 1180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 12:
126 goes into 460 3 times with a remainder of 82.
The next digit of our result is 3. 
Result so far: 123601.5793
If we take 378 away from 460, we end up with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Moving on to step 13:
When dividing 820 by 126, we get 6 with a remainder of 64.
Record the quotient 6 as the next digit in the result. 
Result so far: 123601.57936
The remainder is 64 after subtracting 756 from 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 14:
126 goes into 640 5 times with a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 123601.579365
If we take 630 away from 640, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 15:
126 can be fit into 100 0 times, resulting in a remainder of 100.
The next digit of our result is 0. 
Result so far: 123601.579365
Subtract 0 from 100 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Going ahead to step 16:
When dividing 1000 by 126, we get 7 with a remainder of 118.
Put 7 as the next digit of the answer. 
Result so far: 123601.57936507
The remainder is 118 after subtracting 882 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

The final outcome is 123601.57936507, with a leftover of 1.18e-07.