We look at the division of 811621 by 4 
The aim is to understand the frequency of 4 in 811621.

On to step 1:
4 goes into 8 2 times with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 8 away from 8, we end up with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 4

On to step 2:
4 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 20.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 4

On to step 3:
4 can be fit into 11 2 times, resulting in a remainder of 3.
The next digit of our result is 2. 
Result so far: 202.0
The remainder is 3 after subtracting 8 from 11.
Include the next digit (6) from the dividend after 3, then repeat: 36 / 4

Step 4:
36 divided by 4 is 9 with a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 2029.0
The remainder is 0 after subtracting 36 from 36.
Include the next digit (2) from the dividend after 0, then repeat: 2 / 4

Step 5:
4 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 20290.0
Subtract 0 from 2 to get 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 4

Advancing to step 6:
When dividing 21 by 4, we get 5 with a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 202905.0
Deduct 20 from 21 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
4 can be fit into 10 2 times, resulting in a remainder of 2.
Use 2 as the next digit of our solution. 
Result so far: 202905.2
Deduct 8 from 10 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
20 divided by 4 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 202905.25
Subtracting 20 from 20 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
If we divide 0 by 4, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 202905.25
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 10:
The number 4 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 202905.25
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 202905.25 with a balance of 0.0.