We look at the division of 390860 by 87 
We're looking to find how many times 87 goes into 390860.

Going ahead to step 1:
87 can be fit into 3 0 times, resulting in a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 87

Advancing to step 2:
87 goes into 39 0 times with a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Fetch the next digit (0) from the dividend, attach it to 39 and continue: 390 / 87

Moving on to step 3:
When dividing 390 by 87, we get 4 with a remainder of 42.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we subtract 348 from 390, we get 42.
Grab the next digit (8) from the dividend, add it to 42, then carry on: 428 / 87

On to step 4:
When dividing 428 by 87, we get 4 with a remainder of 80.
The next digit of our result is 4. 
Result so far: 44.0
The remainder is 80 after subtracting 348 from 428.
Include the next digit (6) from the dividend after 80, then repeat: 806 / 87

Advancing to step 5:
87 goes into 806 9 times with a remainder of 23.
Write down 9 as next digit of the result. 
Result so far: 449.0
Deduct 783 from 806 and we're left with 23.
Fetch the next digit (0) from the dividend, attach it to 23 and continue: 230 / 87

Step 6:
87 goes into 230 2 times with a remainder of 56.
Use 2 as the next digit of our solution. 
Result so far: 4492.0
Subtracting 174 from 230 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.

Advancing to step 7:
If we divide 560 by 87, we get 6 and a remainder of 38.
Write down 6 as next digit of the result. 
Result so far: 4492.6
If we subtract 522 from 560, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

On to step 8:
380 divided by 87 is 4 with a remainder of 32.
Write down 4 as next digit of the result. 
Result so far: 4492.64
Subtracting 348 from 380 leaves us 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.

Let's proceed to step 9:
320 divided by 87 is 3 with a remainder of 59.
Put 3 as the next digit of the answer. 
Result so far: 4492.643
If we take 261 away from 320, we end up with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Let's proceed to step 10:
590 divided by 87 is 6 with a remainder of 68.
The number 6 becomes the next digit in our result. 
Result so far: 4492.6436
The remainder is 68 after subtracting 522 from 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

On to step 11:
The number 87 fits into 680 7 times, leaving a remainder of 71.
The number 7 becomes the next digit in our result. 
Result so far: 4492.64367
Deduct 609 from 680 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Moving on to step 12:
When dividing 710 by 87, we get 8 with a remainder of 14.
The number 8 becomes the next digit in our result. 
Result so far: 4492.643678
Deduct 696 from 710 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 13:
If we divide 140 by 87, we get 1 and a remainder of 53.
The next digit of our result is 1. 
Result so far: 4492.6436781
Subtracting 87 from 140 leaves us with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 14:
When dividing 530 by 87, we get 6 with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 4492.64367816
The remainder is 8 after subtracting 522 from 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 4492.64367816 with a remainder of 8e-09.