We look at the division of 86187021 by 108 
The aim is to understand the frequency of 108 in 86187021.

Going ahead to step 1:
When dividing 8 by 108, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 108

Advancing to step 2:
86 divided by 108 is 0 with a remainder of 86.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 86 leaves us with 86.
Take the next digit (1) from the dividend and append it to 86, then repeat: 861 / 108

Let's proceed to step 3:
When dividing 861 by 108, we get 7 with a remainder of 105.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtracting 756 from 861 leaves us with 105.
Take the next digit (8) from the dividend and append it to 105, then repeat: 1058 / 108

Going ahead to step 4:
1058 divided by 108 is 9 with a remainder of 86.
Use 9 as the next digit of our solution. 
Result so far: 79.0
Deduct 972 from 1058 and we're left with 86.
Append the next digit (7) from the dividend to 86 and continue with: 867 / 108

Let's proceed to step 5:
When dividing 867 by 108, we get 8 with a remainder of 3.
Write down 8 as next digit of the result. 
Result so far: 798.0
Deduct 864 from 867 and we're left with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 108

Going ahead to step 6:
When dividing 30 by 108, we get 0 with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 7980.0
The remainder is 30 after subtracting 0 from 30.
Grab the next digit (2) from the dividend, add it to 30, then carry on: 302 / 108

On to step 7:
The number 108 fits into 302 2 times, leaving a remainder of 86.
The number 2 becomes the next digit in our result. 
Result so far: 79802.0
Subtract 216 from 302 to get 86.
Bring next digit (1) of the dividend behind the 86 and repeat the process: 861 / 108

On to step 8:
108 can be fit into 861 7 times, resulting in a remainder of 105.
Write down 7 as next digit of the result. 
Result so far: 798027.0
Subtract 756 from 861 to get 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Let's proceed to step 9:
The number 108 fits into 1050 9 times, leaving a remainder of 78.
Record the quotient 9 as the next digit in the result. 
Result so far: 798027.9
Deduct 972 from 1050 and we're left with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 10:
780 divided by 108 is 7 with a remainder of 24.
The number 7 becomes the next digit in our result. 
Result so far: 798027.97
Subtract 756 from 780 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 11:
240 divided by 108 is 2 with a remainder of 24.
The next digit of our result is 2. 
Result so far: 798027.972
Deduct 216 from 240 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 12:
If we divide 240 by 108, we get 2 and a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 798027.9722
Subtracting 216 from 240 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final result is 798027.9722 with a remainder of 0.00024.