We're dividing 886261 by 90 
The aim is to understand the frequency of 90 in 886261.

Step 1:
When dividing 8 by 90, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Append the next digit (8) from the dividend to 8 and continue with: 88 / 90

Advancing to step 2:
90 can be fit into 88 0 times, resulting in a remainder of 88.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 88 to get 88.
Take the next digit (6) from the dividend and append it to 88, then repeat: 886 / 90

Step 3:
If we divide 886 by 90, we get 9 and a remainder of 76.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Deduct 810 from 886 and we're left with 76.
Take the next digit (2) from the dividend and append it to 76, then repeat: 762 / 90

On to step 4:
If we divide 762 by 90, we get 8 and a remainder of 42.
Write down 8 as next digit of the result. 
Result so far: 98.0
Subtract 720 from 762 to get 42.
Bring next digit (6) of the dividend behind the 42 and repeat the process: 426 / 90

Step 5:
90 goes into 426 4 times with a remainder of 66.
Record the quotient 4 as the next digit in the result. 
Result so far: 984.0
Subtracting 360 from 426 leaves us with 66.
Fetch the next digit (1) from the dividend, attach it to 66 and continue: 661 / 90

Moving on to step 6:
When dividing 661 by 90, we get 7 with a remainder of 31.
The next digit of our result is 7. 
Result so far: 9847.0
Deduct 630 from 661 and we're left with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Step 7:
If we divide 310 by 90, we get 3 and a remainder of 40.
Use 3 as the next digit of our solution. 
Result so far: 9847.3
Subtract 270 from 310 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 8:
The number 90 fits into 400 4 times, leaving a remainder of 40.
Record the quotient 4 as the next digit in the result. 
Result so far: 9847.34
Subtract 360 from 400 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 9:
If we divide 400 by 90, we get 4 and a remainder of 40.
The next digit of our result is 4. 
Result so far: 9847.344
Subtracting 360 from 400 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

In conclusion, the division gives 9847.344 with a balance of 0.004.