We divide 398720 by 86
Let's see how many times 86 fits into 398720.

Step 1:
If we divide 3 by 86, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 86

Step 2:
86 can be fit into 39 0 times, resulting in a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Fetch the next digit (8) from the dividend, attach it to 39 and continue: 398 / 86

Step 3:
When dividing 398 by 86, we get 4 with a remainder of 54.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 344 from 398 and we're left with 54.
Bring next digit (7) of the dividend behind the 54 and repeat the process: 547 / 86

Moving on to step 4:
547 divided by 86 is 6 with a remainder of 31.
Use 6 as the next digit of our solution. 
Result so far: 46.0
If we take 516 away from 547, we end up with 31.
Append the next digit (2) from the dividend to 31 and continue with: 312 / 86

Advancing to step 5:
312 divided by 86 is 3 with a remainder of 54.
Use 3 as the next digit of our solution. 
Result so far: 463.0
If we take 258 away from 312, we end up with 54.
Include the next digit (0) from the dividend after 54, then repeat: 540 / 86

Advancing to step 6:
If we divide 540 by 86, we get 6 and a remainder of 24.
Write down 6 as next digit of the result. 
Result so far: 4636.0
Deduct 516 from 540 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 7:
86 can be fit into 240 2 times, resulting in a remainder of 68.
Write down 2 as next digit of the result. 
Result so far: 4636.2
Deduct 172 from 240 and we're left with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Let's proceed to step 8:
When dividing 680 by 86, we get 7 with a remainder of 78.
The number 7 becomes the next digit in our result. 
Result so far: 4636.27
If we take 602 away from 680, we end up with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Moving on to step 9:
The number 86 fits into 780 9 times, leaving a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 4636.279
If we subtract 774 from 780, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 10:
86 goes into 60 0 times with a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 4636.279
Subtracting 0 from 60 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 11:
If we divide 600 by 86, we get 6 and a remainder of 84.
Use 6 as the next digit of our solution. 
Result so far: 4636.27906
Deduct 516 from 600 and we're left with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Step 12:
When dividing 840 by 86, we get 9 with a remainder of 66.
Record the quotient 9 as the next digit in the result. 
Result so far: 4636.279069
If we subtract 774 from 840, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 13:
660 divided by 86 is 7 with a remainder of 58.
Write down 7 as next digit of the result. 
Result so far: 4636.2790697
Deduct 602 from 660 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Let's proceed to step 14:
580 divided by 86 is 6 with a remainder of 64.
Record the quotient 6 as the next digit in the result. 
Result so far: 4636.27906976
If we subtract 516 from 580, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

The final result is 4636.27906976 with a remainder of 6.4e-08.