We're dividing 86577173 by 729 
The aim is to understand the frequency of 729 in 86577173.

Let's proceed to step 1:
If we divide 8 by 729, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
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 / 729

Moving on to step 2:
When dividing 86 by 729, we get 0 with a remainder of 86.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 86 after subtracting 0 from 86.
Bring next digit (5) of the dividend behind the 86 and repeat the process: 865 / 729

Moving on to step 3:
865 divided by 729 is 1 with a remainder of 136.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 729 away from 865, we end up with 136.
Include the next digit (7) from the dividend after 136, then repeat: 1367 / 729

Advancing to step 4:
729 can be fit into 1367 1 times, resulting in a remainder of 638.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
If we take 729 away from 1367, we end up with 638.
Grab the next digit (7) from the dividend, add it to 638, then carry on: 6387 / 729

Advancing to step 5:
The number 729 fits into 6387 8 times, leaving a remainder of 555.
Record the quotient 8 as the next digit in the result. 
Result so far: 118.0
If we take 5832 away from 6387, we end up with 555.
Bring next digit (1) of the dividend behind the 555 and repeat the process: 5551 / 729

Advancing to step 6:
When dividing 5551 by 729, we get 7 with a remainder of 448.
The next digit of our result is 7. 
Result so far: 1187.0
The remainder is 448 after subtracting 5103 from 5551.
Append the next digit (7) from the dividend to 448 and continue with: 4487 / 729

Advancing to step 7:
The number 729 fits into 4487 6 times, leaving a remainder of 113.
The number 6 becomes the next digit in our result. 
Result so far: 11876.0
If we take 4374 away from 4487, we end up with 113.
Bring next digit (3) of the dividend behind the 113 and repeat the process: 1133 / 729

On to step 8:
729 can be fit into 1133 1 times, resulting in a remainder of 404.
Use 1 as the next digit of our solution. 
Result so far: 118761.0
Subtract 729 from 1133 to get 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

On to step 9:
729 can be fit into 4040 5 times, resulting in a remainder of 395.
The number 5 becomes the next digit in our result. 
Result so far: 118761.5
If we take 3645 away from 4040, we end up with 395.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3950, and continue the process.

Step 10:
729 goes into 3950 5 times with a remainder of 305.
Record the quotient 5 as the next digit in the result. 
Result so far: 118761.55
The remainder is 305 after subtracting 3645 from 3950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

The final outcome is 118761.55, with a leftover of 0.305.