We look at the division of 84520 by 4 
The aim is to understand the frequency of 4 in 84520.

Advancing to step 1:
4 goes into 8 2 times with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 8 from 8, we get 0.
Grab the next digit (4) from the dividend, add it to 0, then carry on: 4 / 4

Advancing to step 2:
4 goes into 4 1 times with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 21.0
If we take 4 away from 4, we end up with 0.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 4

Advancing to step 3:
4 can be fit into 5 1 times, resulting in a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 211.0
Subtract 4 from 5 to get 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 4

Moving on to step 4:
4 can be fit into 12 3 times, resulting in a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 2113.0
If we take 12 away from 12, we end up with 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 4

Let's proceed to step 5:
4 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 21130.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 6:
4 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 21130.0
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.

Advancing to step 7:
When dividing 0 by 4, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 21130.0
Subtracting 0 from 0 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.

The final outcome is 21130.0, with a leftover of 0.0.