We're dividing 86366901 by 84 
The aim is to understand the frequency of 84 in 86366901.

On to step 1:
The number 84 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 84

Going ahead to step 2:
If we divide 86 by 84, we get 1 and a remainder of 2.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 84 from 86 to get 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 84

Let's proceed to step 3:
The number 84 fits into 23 0 times, leaving a remainder of 23.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtracting 0 from 23 leaves us with 23.
Append the next digit (6) from the dividend to 23 and continue with: 236 / 84

On to step 4:
When dividing 236 by 84, we get 2 with a remainder of 68.
The next digit of our result is 2. 
Result so far: 102.0
If we take 168 away from 236, we end up with 68.
Bring next digit (6) of the dividend behind the 68 and repeat the process: 686 / 84

On to step 5:
If we divide 686 by 84, we get 8 and a remainder of 14.
The next digit of our result is 8. 
Result so far: 1028.0
Subtracting 672 from 686 leaves us with 14.
Append the next digit (9) from the dividend to 14 and continue with: 149 / 84

Advancing to step 6:
When dividing 149 by 84, we get 1 with a remainder of 65.
Record the quotient 1 as the next digit in the result. 
Result so far: 10281.0
If we subtract 84 from 149, we get 65.
Include the next digit (0) from the dividend after 65, then repeat: 650 / 84

Step 7:
84 goes into 650 7 times with a remainder of 62.
Write down 7 as next digit of the result. 
Result so far: 102817.0
Deduct 588 from 650 and we're left with 62.
Fetch the next digit (1) from the dividend, attach it to 62 and continue: 621 / 84

Step 8:
84 goes into 621 7 times with a remainder of 33.
Use 7 as the next digit of our solution. 
Result so far: 1028177.0
Subtracting 588 from 621 leaves us with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Going ahead to step 9:
The number 84 fits into 330 3 times, leaving a remainder of 78.
Use 3 as the next digit of our solution. 
Result so far: 1028177.3
If we subtract 252 from 330, we get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Moving on to step 10:
The number 84 fits into 780 9 times, leaving a remainder of 24.
Write down 9 as next digit of the result. 
Result so far: 1028177.39
Subtracting 756 from 780 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.

Moving on to step 11:
If we divide 240 by 84, we get 2 and a remainder of 72.
The number 2 becomes the next digit in our result. 
Result so far: 1028177.392
The remainder is 72 after subtracting 168 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 12:
The number 84 fits into 720 8 times, leaving a remainder of 48.
Record the quotient 8 as the next digit in the result. 
Result so far: 1028177.3928
The remainder is 48 after subtracting 672 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 13:
When dividing 480 by 84, we get 5 with a remainder of 60.
Use 5 as the next digit of our solution. 
Result so far: 1028177.39285
If we take 420 away from 480, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 14:
The number 84 fits into 600 7 times, leaving a remainder of 12.
Use 7 as the next digit of our solution. 
Result so far: 1028177.392857
Deduct 588 from 600 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 15:
The number 84 fits into 120 1 times, leaving a remainder of 36.
Write down 1 as next digit of the result. 
Result so far: 1028177.3928571
Deduct 84 from 120 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 16:
84 goes into 360 4 times with a remainder of 24.
The number 4 becomes the next digit in our result. 
Result so far: 1028177.39285714
Deduct 336 from 360 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.

The final outcome is 1028177.39285714, with a leftover of 2.4e-08.