Let's divide 861718 by 12
We're looking to find how many times 12 goes into 861718.

Step 1:
12 can be fit into 8 0 times, resulting in a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 12

Let's proceed to step 2:
The number 12 fits into 86 7 times, leaving a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 7.0
The remainder is 2 after subtracting 84 from 86.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 12

Step 3:
12 can be fit into 21 1 times, resulting in a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 71.0
Subtract 12 from 21 to get 9.
Bring next digit (7) of the dividend behind the 9 and repeat the process: 97 / 12

Moving on to step 4:
97 divided by 12 is 8 with a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 718.0
If we subtract 96 from 97, we get 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 12

Step 5:
11 divided by 12 is 0 with a remainder of 11.
Write down 0 as next digit of the result. 
Result so far: 7180.0
Deduct 0 from 11 and we're left with 11.
Append the next digit (8) from the dividend to 11 and continue with: 118 / 12

Advancing to step 6:
12 goes into 118 9 times with a remainder of 10.
Record the quotient 9 as the next digit in the result. 
Result so far: 71809.0
Subtract 108 from 118 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 7:
100 divided by 12 is 8 with a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 71809.8
If we take 96 away from 100, we end up 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:
When dividing 40 by 12, we get 3 with a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 71809.83
Subtract 36 from 40 to get 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 9:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 71809.833
The remainder is 4 after subtracting 36 from 40.
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 71809.833, with a leftover of 0.0004.