We look at the division of 86109394 by 861 
We're looking to find how many times 861 goes into 86109394.

Let's proceed to step 1:
If we divide 8 by 861, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 861

Going ahead to step 2:
861 can be fit into 86 0 times, resulting in a remainder of 86.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 86, we get 86.
Grab the next digit (1) from the dividend, add it to 86, then carry on: 861 / 861

Let's proceed to step 3:
861 goes into 861 1 times with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 861 from 861 to get 0.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 861

Moving on to step 4:
The number 861 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
The remainder is 0 after subtracting 0 from 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 861

Advancing to step 5:
The number 861 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 100.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (3) of the dividend behind the 9 and repeat the process: 93 / 861

Advancing to step 6:
If we divide 93 by 861, we get 0 and a remainder of 93.
The next digit of our result is 0. 
Result so far: 1000.0
Deduct 0 from 93 and we're left with 93.
Take the next digit (9) from the dividend and append it to 93, then repeat: 939 / 861

Going ahead to step 7:
861 can be fit into 939 1 times, resulting in a remainder of 78.
Record the quotient 1 as the next digit in the result. 
Result so far: 10001.0
If we subtract 861 from 939, we get 78.
Fetch the next digit (4) from the dividend, attach it to 78 and continue: 784 / 861

Moving on to step 8:
861 can be fit into 784 0 times, resulting in a remainder of 784.
Put 0 as the next digit of the answer. 
Result so far: 100010.0
If we take 0 away from 784, we end up with 784.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7840, and continue the process.

Advancing to step 9:
If we divide 7840 by 861, we get 9 and a remainder of 91.
Record the quotient 9 as the next digit in the result. 
Result so far: 100010.9
Subtracting 7749 from 7840 leaves us with 91.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

Moving on to step 10:
861 can be fit into 910 1 times, resulting in a remainder of 49.
Write down 1 as next digit of the result. 
Result so far: 100010.91
Subtract 861 from 910 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Going ahead to step 11:
The number 861 fits into 490 0 times, leaving a remainder of 490.
Write down 0 as next digit of the result. 
Result so far: 100010.91
The remainder is 490 after subtracting 0 from 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

On to step 12:
If we divide 4900 by 861, we get 5 and a remainder of 595.
The next digit of our result is 5. 
Result so far: 100010.9105
If we subtract 4305 from 4900, we get 595.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5950, and continue the process.

Advancing to step 13:
861 can be fit into 5950 6 times, resulting in a remainder of 784.
Record the quotient 6 as the next digit in the result. 
Result so far: 100010.91056
Deduct 5166 from 5950 and we're left with 784.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7840, and continue the process.

Let's proceed to step 14:
861 can be fit into 7840 9 times, resulting in a remainder of 91.
The number 9 becomes the next digit in our result. 
Result so far: 100010.910569
Deduct 7749 from 7840 and we're left with 91.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

On to step 15:
If we divide 910 by 861, we get 1 and a remainder of 49.
Put 1 as the next digit of the answer. 
Result so far: 100010.9105691
Deduct 861 from 910 and we're left with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Moving on to step 16:
The number 861 fits into 490 0 times, leaving a remainder of 490.
Put 0 as the next digit of the answer. 
Result so far: 100010.9105691
Subtract 0 from 490 to get 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

The final outcome is 100010.9105691, with a leftover of 4.9e-07.