We look at the division of 858592 by 12 
We're looking to find how many times 12 goes into 858592.

Advancing to step 1:
8 divided by 12 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 12

Advancing to step 2:
12 goes into 85 7 times with a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 7.0
If we subtract 84 from 85, we get 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 12

On to step 3:
The number 12 fits into 18 1 times, leaving a remainder of 6.
The next digit of our result is 1. 
Result so far: 71.0
If we take 12 away from 18, we end up with 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 12

Let's proceed to step 4:
12 can be fit into 65 5 times, resulting in a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 715.0
The remainder is 5 after subtracting 60 from 65.
Include the next digit (9) from the dividend after 5, then repeat: 59 / 12

Step 5:
12 can be fit into 59 4 times, resulting in a remainder of 11.
Put 4 as the next digit of the answer. 
Result so far: 7154.0
The remainder is 11 after subtracting 48 from 59.
Append the next digit (2) from the dividend to 11 and continue with: 112 / 12

Let's proceed to step 6:
12 can be fit into 112 9 times, resulting in a remainder of 4.
Write down 9 as next digit of the result. 
Result so far: 71549.0
The remainder is 4 after subtracting 108 from 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 7:
12 can be fit into 40 3 times, resulting in a remainder of 4.
The next digit of our result is 3. 
Result so far: 71549.3
Subtracting 36 from 40 leaves us 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.

On to step 8:
If we divide 40 by 12, we get 3 and a remainder of 4.
The next digit of our result is 3. 
Result so far: 71549.33
Subtracting 36 from 40 leaves us 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.

The final outcome is 71549.33, with a leftover of 0.004.