We're dividing 12120 by 78 
Our goal is to divide 12120 by 78.

Let's proceed to step 1:
The number 78 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.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 78

On to step 2:
12 divided by 78 is 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 78

Advancing to step 3:
78 goes into 121 1 times with a remainder of 43.
The next digit of our result is 1. 
Result so far: 1.0
If we take 78 away from 121, we end up with 43.
Bring next digit (2) of the dividend behind the 43 and repeat the process: 432 / 78

Going ahead to step 4:
78 goes into 432 5 times with a remainder of 42.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
Subtracting 390 from 432 leaves us with 42.
Bring next digit (0) of the dividend behind the 42 and repeat the process: 420 / 78

Advancing to step 5:
When dividing 420 by 78, we get 5 with a remainder of 30.
The next digit of our result is 5. 
Result so far: 155.0
The remainder is 30 after subtracting 390 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 6:
78 goes into 300 3 times with a remainder of 66.
Write down 3 as next digit of the result. 
Result so far: 155.3
If we take 234 away from 300, we end up with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Going ahead to step 7:
The number 78 fits into 660 8 times, leaving a remainder of 36.
Record the quotient 8 as the next digit in the result. 
Result so far: 155.38
Deduct 624 from 660 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 8:
360 divided by 78 is 4 with a remainder of 48.
Record the quotient 4 as the next digit in the result. 
Result so far: 155.384
Subtract 312 from 360 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 9:
When dividing 480 by 78, we get 6 with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 155.3846
If we subtract 468 from 480, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 10:
120 divided by 78 is 1 with a remainder of 42.
The next digit of our result is 1. 
Result so far: 155.38461
Subtract 78 from 120 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 11:
78 can be fit into 420 5 times, resulting in a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 155.384615
If we subtract 390 from 420, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 12:
The number 78 fits into 300 3 times, leaving a remainder of 66.
Use 3 as the next digit of our solution. 
Result so far: 155.3846153
The remainder is 66 after subtracting 234 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 13:
When dividing 660 by 78, we get 8 with a remainder of 36.
Use 8 as the next digit of our solution. 
Result so far: 155.38461538
If we take 624 away from 660, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

In conclusion, the division gives 155.38461538 with a balance of 3.6e-08.