Let's divide 91490 by 4
The aim is to understand the frequency of 4 in 91490.

Step 1:
When dividing 9 by 4, we get 2 with a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 8 from 9 and we're left with 1.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 4

On to step 2:
11 divided by 4 is 2 with a remainder of 3.
Write down 2 as next digit of the result. 
Result so far: 22.0
Subtract 8 from 11 to get 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 4

Moving on to step 3:
4 goes into 34 8 times with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 228.0
The remainder is 2 after subtracting 32 from 34.
Append the next digit (9) from the dividend to 2 and continue with: 29 / 4

Let's proceed to step 4:
The number 4 fits into 29 7 times, leaving a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 2287.0
Subtract 28 from 29 to get 1.
Append the next digit (0) from the dividend to 1 and continue with: 10 / 4

Step 5:
If we divide 10 by 4, we get 2 and a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 22872.0
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.

On to step 6:
The number 4 fits into 20 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 22872.5
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 7:
If we divide 0 by 4, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 22872.5
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.

Advancing to step 8:
4 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 22872.5
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.

After the division, we end up with 22872.5 and a remainder of 0.0.