We divide 399684 by 79
Let's see how many times 79 fits into 399684.

Going ahead to step 1:
When dividing 3 by 79, we get 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 79

Going ahead to step 2:
If we divide 39 by 79, we get 0 and a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Grab the next digit (9) from the dividend, add it to 39, then carry on: 399 / 79

On to step 3:
79 can be fit into 399 5 times, resulting in a remainder of 4.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we take 395 away from 399, we end up with 4.
Include the next digit (6) from the dividend after 4, then repeat: 46 / 79

Let's proceed to step 4:
79 can be fit into 46 0 times, resulting in a remainder of 46.
The next digit of our result is 0. 
Result so far: 50.0
The remainder is 46 after subtracting 0 from 46.
Include the next digit (8) from the dividend after 46, then repeat: 468 / 79

Advancing to step 5:
If we divide 468 by 79, we get 5 and a remainder of 73.
The number 5 becomes the next digit in our result. 
Result so far: 505.0
The remainder is 73 after subtracting 395 from 468.
Bring next digit (4) of the dividend behind the 73 and repeat the process: 734 / 79

Step 6:
79 goes into 734 9 times with a remainder of 23.
The number 9 becomes the next digit in our result. 
Result so far: 5059.0
The remainder is 23 after subtracting 711 from 734.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

On to step 7:
If we divide 230 by 79, we get 2 and a remainder of 72.
The number 2 becomes the next digit in our result. 
Result so far: 5059.2
If we subtract 158 from 230, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 8:
If we divide 720 by 79, we get 9 and a remainder of 9.
Record the quotient 9 as the next digit in the result. 
Result so far: 5059.29
Subtracting 711 from 720 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 9:
The number 79 fits into 90 1 times, leaving a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 5059.291
If we subtract 79 from 90, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 10:
110 divided by 79 is 1 with a remainder of 31.
Put 1 as the next digit of the answer. 
Result so far: 5059.2911
If we subtract 79 from 110, we get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

The final result is 5059.2911 with a remainder of 0.00031.