We're dividing 389721 by 86 
Our goal is to divide 389721 by 86.

Let's proceed to step 1:
If we divide 3 by 86, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 86

Going ahead to step 2:
86 can be fit into 38 0 times, resulting in a remainder of 38.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 38 after subtracting 0 from 38.
Grab the next digit (9) from the dividend, add it to 38, then carry on: 389 / 86

Advancing to step 3:
When dividing 389 by 86, we get 4 with a remainder of 45.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 344 from 389, we get 45.
Include the next digit (7) from the dividend after 45, then repeat: 457 / 86

Advancing to step 4:
The number 86 fits into 457 5 times, leaving a remainder of 27.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
If we take 430 away from 457, we end up with 27.
Append the next digit (2) from the dividend to 27 and continue with: 272 / 86

Moving on to step 5:
86 goes into 272 3 times with a remainder of 14.
Record the quotient 3 as the next digit in the result. 
Result so far: 453.0
The remainder is 14 after subtracting 258 from 272.
Include the next digit (1) from the dividend after 14, then repeat: 141 / 86

On to step 6:
141 divided by 86 is 1 with a remainder of 55.
Use 1 as the next digit of our solution. 
Result so far: 4531.0
If we subtract 86 from 141, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Step 7:
550 divided by 86 is 6 with a remainder of 34.
Put 6 as the next digit of the answer. 
Result so far: 4531.6
The remainder is 34 after subtracting 516 from 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 8:
86 goes into 340 3 times with a remainder of 82.
Put 3 as the next digit of the answer. 
Result so far: 4531.63
The remainder is 82 after subtracting 258 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

On to step 9:
If we divide 820 by 86, we get 9 and a remainder of 46.
Record the quotient 9 as the next digit in the result. 
Result so far: 4531.639
Subtract 774 from 820 to get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 10:
86 goes into 460 5 times with a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 4531.6395
If we take 430 away from 460, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 11:
When dividing 300 by 86, we get 3 with a remainder of 42.
Put 3 as the next digit of the answer. 
Result so far: 4531.63953
Subtracting 258 from 300 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 12:
When dividing 420 by 86, we get 4 with a remainder of 76.
Write down 4 as next digit of the result. 
Result so far: 4531.639534
If we take 344 away from 420, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 13:
When dividing 760 by 86, we get 8 with a remainder of 72.
Record the quotient 8 as the next digit in the result. 
Result so far: 4531.6395348
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.

Going ahead to step 14:
If we divide 720 by 86, we get 8 and a remainder of 32.
Use 8 as the next digit of our solution. 
Result so far: 4531.63953488
Subtract 688 from 720 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

The final result is 4531.63953488 with a remainder of 3.2e-08.