We look at the division of 861585 by 4 
We're looking to find how many times 4 goes into 861585.

Step 1:
4 goes into 8 2 times with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 8 away from 8, we end up with 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 4

Going ahead to step 2:
If we divide 6 by 4, we get 1 and a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 21.0
If we take 4 away from 6, we end up with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 4

Let's proceed to step 3:
When dividing 21 by 4, we get 5 with a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 215.0
The remainder is 1 after subtracting 20 from 21.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 4

Advancing to step 4:
When dividing 15 by 4, we get 3 with a remainder of 3.
Put 3 as the next digit of the answer. 
Result so far: 2153.0
Subtracting 12 from 15 leaves us with 3.
Grab the next digit (8) from the dividend, add it to 3, then carry on: 38 / 4

Let's proceed to step 5:
The number 4 fits into 38 9 times, leaving a remainder of 2.
Write down 9 as next digit of the result. 
Result so far: 21539.0
Deduct 36 from 38 and we're left with 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 4

On to step 6:
4 can be fit into 25 6 times, resulting in a remainder of 1.
The next digit of our result is 6. 
Result so far: 215396.0
If we subtract 24 from 25, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 7:
The number 4 fits into 10 2 times, leaving a remainder of 2.
Use 2 as the next digit of our solution. 
Result so far: 215396.2
If we take 8 away from 10, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 8:
4 goes into 20 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 215396.25
If we take 20 away from 20, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
4 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 215396.25
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
If we divide 0 by 4, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 215396.25
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 215396.25 with a remainder of 0.0.