We look at the division of 77778431 by 120 
We want to divide 77778431 by 120.

Moving on to step 1:
7 divided by 120 is 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 120

Advancing to step 2:
When dividing 77 by 120, we get 0 with a remainder of 77.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 77, we get 77.
Bring next digit (7) of the dividend behind the 77 and repeat the process: 777 / 120

Step 3:
777 divided by 120 is 6 with a remainder of 57.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Deduct 720 from 777 and we're left with 57.
Bring next digit (7) of the dividend behind the 57 and repeat the process: 577 / 120

On to step 4:
577 divided by 120 is 4 with a remainder of 97.
Put 4 as the next digit of the answer. 
Result so far: 64.0
Deduct 480 from 577 and we're left with 97.
Fetch the next digit (8) from the dividend, attach it to 97 and continue: 978 / 120

Let's proceed to step 5:
If we divide 978 by 120, we get 8 and a remainder of 18.
The next digit of our result is 8. 
Result so far: 648.0
If we take 960 away from 978, we end up with 18.
Bring next digit (4) of the dividend behind the 18 and repeat the process: 184 / 120

Going ahead to step 6:
If we divide 184 by 120, we get 1 and a remainder of 64.
Use 1 as the next digit of our solution. 
Result so far: 6481.0
If we take 120 away from 184, we end up with 64.
Append the next digit (3) from the dividend to 64 and continue with: 643 / 120

Moving on to step 7:
If we divide 643 by 120, we get 5 and a remainder of 43.
The next digit of our result is 5. 
Result so far: 64815.0
The remainder is 43 after subtracting 600 from 643.
Include the next digit (1) from the dividend after 43, then repeat: 431 / 120

On to step 8:
When dividing 431 by 120, we get 3 with a remainder of 71.
The next digit of our result is 3. 
Result so far: 648153.0
The remainder is 71 after subtracting 360 from 431.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 9:
120 can be fit into 710 5 times, resulting in a remainder of 110.
The number 5 becomes the next digit in our result. 
Result so far: 648153.5
If we take 600 away from 710, we end up with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Let's proceed to step 10:
When dividing 1100 by 120, we get 9 with a remainder of 20.
Record the quotient 9 as the next digit in the result. 
Result so far: 648153.59
Subtract 1080 from 1100 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 11:
200 divided by 120 is 1 with a remainder of 80.
Use 1 as the next digit of our solution. 
Result so far: 648153.591
If we subtract 120 from 200, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 12:
120 can be fit into 800 6 times, resulting in a remainder of 80.
Write down 6 as next digit of the result. 
Result so far: 648153.5916
Subtracting 720 from 800 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 13:
If we divide 800 by 120, we get 6 and a remainder of 80.
Put 6 as the next digit of the answer. 
Result so far: 648153.59166
If we subtract 720 from 800, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The final outcome is 648153.59166, with a leftover of 8e-05.