We're dividing 454789 by 45 
The aim is to understand the frequency of 45 in 454789.

Moving on to step 1:
If we divide 4 by 45, we get 0 and a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (5) from the dividend after 4, then repeat: 45 / 45

Step 2:
If we divide 45 by 45, we get 1 and a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 45 from 45 and we're left with 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 45

Going ahead to step 3:
If we divide 4 by 45, we get 0 and a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
If we subtract 0 from 4, we get 4.
Grab the next digit (7) from the dividend, add it to 4, then carry on: 47 / 45

Going ahead to step 4:
45 can be fit into 47 1 times, resulting in a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 101.0
Deduct 45 from 47 and we're left with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 45

Moving on to step 5:
When dividing 28 by 45, we get 0 with a remainder of 28.
Use 0 as the next digit of our solution. 
Result so far: 1010.0
If we subtract 0 from 28, we get 28.
Include the next digit (9) from the dividend after 28, then repeat: 289 / 45

Moving on to step 6:
45 can be fit into 289 6 times, resulting in a remainder of 19.
Write down 6 as next digit of the result. 
Result so far: 10106.0
Deduct 270 from 289 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 7:
45 goes into 190 4 times with a remainder of 10.
Write down 4 as next digit of the result. 
Result so far: 10106.4
Subtracting 180 from 190 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
45 can be fit into 100 2 times, resulting in a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 10106.42
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 9:
45 can be fit into 100 2 times, resulting in a remainder of 10.
Put 2 as the next digit of the answer. 
Result so far: 10106.422
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 10106.422, with a leftover of 0.001.