We divide 392978 by 80
We're looking to find how many times 80 goes into 392978.

On to step 1:
3 divided by 80 is 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 80

Let's proceed to step 2:
When dividing 39 by 80, we get 0 with a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Take the next digit (2) from the dividend and append it to 39, then repeat: 392 / 80

Moving on to step 3:
392 divided by 80 is 4 with a remainder of 72.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtracting 320 from 392 leaves us with 72.
Append the next digit (9) from the dividend to 72 and continue with: 729 / 80

On to step 4:
729 divided by 80 is 9 with a remainder of 9.
Record the quotient 9 as the next digit in the result. 
Result so far: 49.0
If we subtract 720 from 729, we get 9.
Include the next digit (7) from the dividend after 9, then repeat: 97 / 80

Let's proceed to step 5:
80 can be fit into 97 1 times, resulting in a remainder of 17.
Write down 1 as next digit of the result. 
Result so far: 491.0
Subtracting 80 from 97 leaves us with 17.
Take the next digit (8) from the dividend and append it to 17, then repeat: 178 / 80

Moving on to step 6:
When dividing 178 by 80, we get 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 4912.0
The remainder is 18 after subtracting 160 from 178.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 7:
80 goes into 180 2 times with a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 4912.2
Deduct 160 from 180 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 8:
When dividing 200 by 80, we get 2 with a remainder of 40.
Write down 2 as next digit of the result. 
Result so far: 4912.22
The remainder is 40 after subtracting 160 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 4912.22, with a leftover of 0.04.