We divide 390521 by 86
Let's see how many times 86 fits into 390521.

Step 1:
The number 86 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 86

Advancing to step 2:
When dividing 39 by 86, we get 0 with a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Append the next digit (0) from the dividend to 39 and continue with: 390 / 86

Going ahead to step 3:
86 goes into 390 4 times with a remainder of 46.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we subtract 344 from 390, we get 46.
Grab the next digit (5) from the dividend, add it to 46, then carry on: 465 / 86

Step 4:
If we divide 465 by 86, we get 5 and a remainder of 35.
The next digit of our result is 5. 
Result so far: 45.0
Deduct 430 from 465 and we're left with 35.
Take the next digit (2) from the dividend and append it to 35, then repeat: 352 / 86

Let's proceed to step 5:
86 goes into 352 4 times with a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 454.0
If we subtract 344 from 352, we get 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 86

Step 6:
81 divided by 86 is 0 with a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 4540.0
If we subtract 0 from 81, we get 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Moving on to step 7:
When dividing 810 by 86, we get 9 with a remainder of 36.
Put 9 as the next digit of the answer. 
Result so far: 4540.9
If we take 774 away from 810, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 8:
The number 86 fits into 360 4 times, leaving a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 4540.94
Deduct 344 from 360 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 9:
When dividing 160 by 86, we get 1 with a remainder of 74.
The number 1 becomes the next digit in our result. 
Result so far: 4540.941
If we take 86 away from 160, we end up with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

On to step 10:
86 goes into 740 8 times with a remainder of 52.
The number 8 becomes the next digit in our result. 
Result so far: 4540.9418
The remainder is 52 after subtracting 688 from 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 11:
86 can be fit into 520 6 times, resulting in a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 4540.94186
Deduct 516 from 520 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 12:
When dividing 40 by 86, we get 0 with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 4540.94186
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 13:
When dividing 400 by 86, we get 4 with a remainder of 56.
Write down 4 as next digit of the result. 
Result so far: 4540.9418604
Subtracting 344 from 400 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 14:
If we divide 560 by 86, we get 6 and a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 4540.94186046
Deduct 516 from 560 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

The final result is 4540.94186046 with a remainder of 4.4e-08.