398940 divided by 86 
Our goal is to divide 398940 by 86.

Let's proceed to step 1:
3 divided by 86 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 86

Step 2:
39 divided by 86 is 0 with a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Bring next digit (8) of the dividend behind the 39 and repeat the process: 398 / 86

Moving on to step 3:
The number 86 fits into 398 4 times, leaving a remainder of 54.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 344 from 398, we get 54.
Append the next digit (9) from the dividend to 54 and continue with: 549 / 86

Step 4:
86 can be fit into 549 6 times, resulting in a remainder of 33.
The next digit of our result is 6. 
Result so far: 46.0
If we subtract 516 from 549, we get 33.
Grab the next digit (4) from the dividend, add it to 33, then carry on: 334 / 86

On to step 5:
If we divide 334 by 86, we get 3 and a remainder of 76.
Use 3 as the next digit of our solution. 
Result so far: 463.0
If we subtract 258 from 334, we get 76.
Fetch the next digit (0) from the dividend, attach it to 76 and continue: 760 / 86

On to step 6:
760 divided by 86 is 8 with a remainder of 72.
The next digit of our result is 8. 
Result so far: 4638.0
The remainder is 72 after subtracting 688 from 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Advancing to step 7:
The number 86 fits into 720 8 times, leaving a remainder of 32.
Write down 8 as next digit of the result. 
Result so far: 4638.8
Deduct 688 from 720 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 8:
86 goes into 320 3 times with a remainder of 62.
The number 3 becomes the next digit in our result. 
Result so far: 4638.83
The remainder is 62 after subtracting 258 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 9:
86 can be fit into 620 7 times, resulting in a remainder of 18.
The next digit of our result is 7. 
Result so far: 4638.837
If we subtract 602 from 620, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 10:
180 divided by 86 is 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 4638.8372
If we subtract 172 from 180, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 11:
86 goes into 80 0 times with a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 4638.8372
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 12:
800 divided by 86 is 9 with a remainder of 26.
Write down 9 as next digit of the result. 
Result so far: 4638.837209
Subtract 774 from 800 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 13:
86 goes into 260 3 times with a remainder of 2.
Record the quotient 3 as the next digit in the result. 
Result so far: 4638.8372093
The remainder is 2 after subtracting 258 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 14:
86 can be fit into 20 0 times, resulting in a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 4638.8372093
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

After the division, we end up with 4638.8372093 and a remainder of 2e-08.