77155208 ÷ 643 
Our goal is to divide 77155208 by 643.

Moving on to step 1:
643 goes into 7 0 times with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Include the next digit (7) from the dividend after 7, then repeat: 77 / 643

Advancing to step 2:
The number 643 fits into 77 0 times, leaving a remainder of 77.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 77 after subtracting 0 from 77.
Grab the next digit (1) from the dividend, add it to 77, then carry on: 771 / 643

On to step 3:
643 goes into 771 1 times with a remainder of 128.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 643 from 771 and we're left with 128.
Include the next digit (5) from the dividend after 128, then repeat: 1285 / 643

Advancing to step 4:
The number 643 fits into 1285 1 times, leaving a remainder of 642.
The next digit of our result is 1. 
Result so far: 11.0
Deduct 643 from 1285 and we're left with 642.
Fetch the next digit (5) from the dividend, attach it to 642 and continue: 6425 / 643

Step 5:
If we divide 6425 by 643, we get 9 and a remainder of 638.
Put 9 as the next digit of the answer. 
Result so far: 119.0
If we subtract 5787 from 6425, we get 638.
Include the next digit (2) from the dividend after 638, then repeat: 6382 / 643

Let's proceed to step 6:
The number 643 fits into 6382 9 times, leaving a remainder of 595.
Record the quotient 9 as the next digit in the result. 
Result so far: 1199.0
Deduct 5787 from 6382 and we're left with 595.
Grab the next digit (0) from the dividend, add it to 595, then carry on: 5950 / 643

Step 7:
The number 643 fits into 5950 9 times, leaving a remainder of 163.
Put 9 as the next digit of the answer. 
Result so far: 11999.0
The remainder is 163 after subtracting 5787 from 5950.
Bring next digit (8) of the dividend behind the 163 and repeat the process: 1638 / 643

Going ahead to step 8:
When dividing 1638 by 643, we get 2 with a remainder of 352.
Write down 2 as next digit of the result. 
Result so far: 119992.0
Subtracting 1286 from 1638 leaves us with 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Going ahead to step 9:
If we divide 3520 by 643, we get 5 and a remainder of 305.
Use 5 as the next digit of our solution. 
Result so far: 119992.5
If we subtract 3215 from 3520, we get 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Going ahead to step 10:
When dividing 3050 by 643, we get 4 with a remainder of 478.
Write down 4 as next digit of the result. 
Result so far: 119992.54
The remainder is 478 after subtracting 2572 from 3050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4780, and continue the process.

Moving on to step 11:
When dividing 4780 by 643, we get 7 with a remainder of 279.
The next digit of our result is 7. 
Result so far: 119992.547
Subtract 4501 from 4780 to get 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2790, and continue the process.

Let's proceed to step 12:
When dividing 2790 by 643, we get 4 with a remainder of 218.
Record the quotient 4 as the next digit in the result. 
Result so far: 119992.5474
If we subtract 2572 from 2790, we get 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

On to step 13:
The number 643 fits into 2180 3 times, leaving a remainder of 251.
Write down 3 as next digit of the result. 
Result so far: 119992.54743
If we take 1929 away from 2180, we end up with 251.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2510, and continue the process.

Step 14:
643 goes into 2510 3 times with a remainder of 581.
Record the quotient 3 as the next digit in the result. 
Result so far: 119992.547433
If we take 1929 away from 2510, we end up with 581.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5810, and continue the process.

The final outcome is 119992.547433, with a leftover of 5.81e-05.