We look at the division of 55121559 by 786 
We want to divide 55121559 by 786.

Moving on to step 1:
When dividing 5 by 786, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Append the next digit (5) from the dividend to 5 and continue with: 55 / 786

On to step 2:
If we divide 55 by 786, we get 0 and a remainder of 55.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 55 and we're left with 55.
Take the next digit (1) from the dividend and append it to 55, then repeat: 551 / 786

Step 3:
786 can be fit into 551 0 times, resulting in a remainder of 551.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 551 and we're left with 551.
Grab the next digit (2) from the dividend, add it to 551, then carry on: 5512 / 786

Advancing to step 4:
When dividing 5512 by 786, we get 7 with a remainder of 10.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 10 after subtracting 5502 from 5512.
Fetch the next digit (1) from the dividend, attach it to 10 and continue: 101 / 786

Let's proceed to step 5:
When dividing 101 by 786, we get 0 with a remainder of 101.
Write down 0 as next digit of the result. 
Result so far: 70.0
Deduct 0 from 101 and we're left with 101.
Append the next digit (5) from the dividend to 101 and continue with: 1015 / 786

Step 6:
The number 786 fits into 1015 1 times, leaving a remainder of 229.
Use 1 as the next digit of our solution. 
Result so far: 701.0
The remainder is 229 after subtracting 786 from 1015.
Take the next digit (5) from the dividend and append it to 229, then repeat: 2295 / 786

Advancing to step 7:
If we divide 2295 by 786, we get 2 and a remainder of 723.
Record the quotient 2 as the next digit in the result. 
Result so far: 7012.0
If we subtract 1572 from 2295, we get 723.
Bring next digit (9) of the dividend behind the 723 and repeat the process: 7239 / 786

Advancing to step 8:
When dividing 7239 by 786, we get 9 with a remainder of 165.
The next digit of our result is 9. 
Result so far: 70129.0
Deduct 7074 from 7239 and we're left with 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Let's proceed to step 9:
786 goes into 1650 2 times with a remainder of 78.
Record the quotient 2 as the next digit in the result. 
Result so far: 70129.2
Deduct 1572 from 1650 and we're left with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Step 10:
When dividing 780 by 786, we get 0 with a remainder of 780.
The number 0 becomes the next digit in our result. 
Result so far: 70129.2
If we take 0 away from 780, we end up with 780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7800, and continue the process.

Step 11:
7800 divided by 786 is 9 with a remainder of 726.
The next digit of our result is 9. 
Result so far: 70129.209
Subtracting 7074 from 7800 leaves us with 726.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7260, and continue the process.

Step 12:
The number 786 fits into 7260 9 times, leaving a remainder of 186.
Put 9 as the next digit of the answer. 
Result so far: 70129.2099
If we subtract 7074 from 7260, we get 186.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

The final outcome is 70129.2099, with a leftover of 0.00186.