We're dividing 78978686 by 121 
Our goal is to divide 78978686 by 121.

Let's proceed to step 1:
If we divide 7 by 121, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 121

Let's proceed to step 2:
121 can be fit into 78 0 times, resulting in a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Bring next digit (9) of the dividend behind the 78 and repeat the process: 789 / 121

Advancing to step 3:
121 goes into 789 6 times with a remainder of 63.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtract 726 from 789 to get 63.
Take the next digit (7) from the dividend and append it to 63, then repeat: 637 / 121

Step 4:
The number 121 fits into 637 5 times, leaving a remainder of 32.
Use 5 as the next digit of our solution. 
Result so far: 65.0
Deduct 605 from 637 and we're left with 32.
Append the next digit (8) from the dividend to 32 and continue with: 328 / 121

Advancing to step 5:
The number 121 fits into 328 2 times, leaving a remainder of 86.
Use 2 as the next digit of our solution. 
Result so far: 652.0
Subtract 242 from 328 to get 86.
Grab the next digit (6) from the dividend, add it to 86, then carry on: 866 / 121

Moving on to step 6:
121 goes into 866 7 times with a remainder of 19.
Write down 7 as next digit of the result. 
Result so far: 6527.0
The remainder is 19 after subtracting 847 from 866.
Take the next digit (8) from the dividend and append it to 19, then repeat: 198 / 121

Step 7:
The number 121 fits into 198 1 times, leaving a remainder of 77.
Write down 1 as next digit of the result. 
Result so far: 65271.0
Deduct 121 from 198 and we're left with 77.
Include the next digit (6) from the dividend after 77, then repeat: 776 / 121

Step 8:
The number 121 fits into 776 6 times, leaving a remainder of 50.
Record the quotient 6 as the next digit in the result. 
Result so far: 652716.0
Subtract 726 from 776 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 9:
500 divided by 121 is 4 with a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 652716.4
Subtract 484 from 500 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 10:
If we divide 160 by 121, we get 1 and a remainder of 39.
The number 1 becomes the next digit in our result. 
Result so far: 652716.41
Subtract 121 from 160 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 11:
If we divide 390 by 121, we get 3 and a remainder of 27.
Write down 3 as next digit of the result. 
Result so far: 652716.413
Subtract 363 from 390 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Moving on to step 12:
121 can be fit into 270 2 times, resulting in a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 652716.4132
Deduct 242 from 270 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 13:
121 can be fit into 280 2 times, resulting in a remainder of 38.
The next digit of our result is 2. 
Result so far: 652716.41322
The remainder is 38 after subtracting 242 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

In conclusion, the division gives 652716.41322 with a balance of 3.8e-05.