We're dividing 91804001 by 406 
The aim is to understand the frequency of 406 in 91804001.

Step 1:
9 divided by 406 is 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 406

Moving on to step 2:
406 goes into 91 0 times with a remainder of 91.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 91, we get 91.
Fetch the next digit (8) from the dividend, attach it to 91 and continue: 918 / 406

Moving on to step 3:
406 goes into 918 2 times with a remainder of 106.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 812 from 918, we get 106.
Take the next digit (0) from the dividend and append it to 106, then repeat: 1060 / 406

On to step 4:
1060 divided by 406 is 2 with a remainder of 248.
Record the quotient 2 as the next digit in the result. 
Result so far: 22.0
Deduct 812 from 1060 and we're left with 248.
Fetch the next digit (4) from the dividend, attach it to 248 and continue: 2484 / 406

Step 5:
When dividing 2484 by 406, we get 6 with a remainder of 48.
Record the quotient 6 as the next digit in the result. 
Result so far: 226.0
Subtracting 2436 from 2484 leaves us with 48.
Bring next digit (0) of the dividend behind the 48 and repeat the process: 480 / 406

Moving on to step 6:
If we divide 480 by 406, we get 1 and a remainder of 74.
The next digit of our result is 1. 
Result so far: 2261.0
If we subtract 406 from 480, we get 74.
Append the next digit (0) from the dividend to 74 and continue with: 740 / 406

Moving on to step 7:
If we divide 740 by 406, we get 1 and a remainder of 334.
The next digit of our result is 1. 
Result so far: 22611.0
If we subtract 406 from 740, we get 334.
Append the next digit (1) from the dividend to 334 and continue with: 3341 / 406

Moving on to step 8:
406 can be fit into 3341 8 times, resulting in a remainder of 93.
Record the quotient 8 as the next digit in the result. 
Result so far: 226118.0
The remainder is 93 after subtracting 3248 from 3341.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Going ahead to step 9:
406 goes into 930 2 times with a remainder of 118.
Write down 2 as next digit of the result. 
Result so far: 226118.2
Subtracting 812 from 930 leaves us with 118.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

On to step 10:
When dividing 1180 by 406, we get 2 with a remainder of 368.
Write down 2 as next digit of the result. 
Result so far: 226118.22
If we subtract 812 from 1180, we get 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

In conclusion, the division gives 226118.22 with a balance of 0.368.