We're dividing 71841804 by 215 
The aim is to understand the frequency of 215 in 71841804.

On to step 1:
If we divide 7 by 215, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 215

Going ahead to step 2:
215 can be fit into 71 0 times, resulting in a remainder of 71.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 71, we end up with 71.
Take the next digit (8) from the dividend and append it to 71, then repeat: 718 / 215

On to step 3:
215 goes into 718 3 times with a remainder of 73.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 645 from 718 to get 73.
Include the next digit (4) from the dividend after 73, then repeat: 734 / 215

On to step 4:
When dividing 734 by 215, we get 3 with a remainder of 89.
Write down 3 as next digit of the result. 
Result so far: 33.0
If we take 645 away from 734, we end up with 89.
Include the next digit (1) from the dividend after 89, then repeat: 891 / 215

Advancing to step 5:
215 goes into 891 4 times with a remainder of 31.
The number 4 becomes the next digit in our result. 
Result so far: 334.0
Subtract 860 from 891 to get 31.
Grab the next digit (8) from the dividend, add it to 31, then carry on: 318 / 215

On to step 6:
215 goes into 318 1 times with a remainder of 103.
The number 1 becomes the next digit in our result. 
Result so far: 3341.0
Subtract 215 from 318 to get 103.
Bring next digit (0) of the dividend behind the 103 and repeat the process: 1030 / 215

Moving on to step 7:
1030 divided by 215 is 4 with a remainder of 170.
The next digit of our result is 4. 
Result so far: 33414.0
If we take 860 away from 1030, we end up with 170.
Take the next digit (4) from the dividend and append it to 170, then repeat: 1704 / 215

Let's proceed to step 8:
If we divide 1704 by 215, we get 7 and a remainder of 199.
Write down 7 as next digit of the result. 
Result so far: 334147.0
If we subtract 1505 from 1704, we get 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Step 9:
The number 215 fits into 1990 9 times, leaving a remainder of 55.
Record the quotient 9 as the next digit in the result. 
Result so far: 334147.9
Subtract 1935 from 1990 to get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 10:
215 goes into 550 2 times with a remainder of 120.
The number 2 becomes the next digit in our result. 
Result so far: 334147.92
The remainder is 120 after subtracting 430 from 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Step 11:
215 goes into 1200 5 times with a remainder of 125.
The number 5 becomes the next digit in our result. 
Result so far: 334147.925
Subtract 1075 from 1200 to get 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Step 12:
215 can be fit into 1250 5 times, resulting in a remainder of 175.
Put 5 as the next digit of the answer. 
Result so far: 334147.9255
If we take 1075 away from 1250, we end up with 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

The final outcome is 334147.9255, with a leftover of 0.00175.