We look at the division of 578692 by 45 
The aim is to understand the frequency of 45 in 578692.

On to step 1:
5 divided by 45 is 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 45

Step 2:
45 goes into 57 1 times with a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 45 from 57, we get 12.
Include the next digit (8) from the dividend after 12, then repeat: 128 / 45

On to step 3:
128 divided by 45 is 2 with a remainder of 38.
Write down 2 as next digit of the result. 
Result so far: 12.0
Subtracting 90 from 128 leaves us with 38.
Fetch the next digit (6) from the dividend, attach it to 38 and continue: 386 / 45

Step 4:
When dividing 386 by 45, we get 8 with a remainder of 26.
The number 8 becomes the next digit in our result. 
Result so far: 128.0
Deduct 360 from 386 and we're left with 26.
Take the next digit (9) from the dividend and append it to 26, then repeat: 269 / 45

Let's proceed to step 5:
The number 45 fits into 269 5 times, leaving a remainder of 44.
The number 5 becomes the next digit in our result. 
Result so far: 1285.0
The remainder is 44 after subtracting 225 from 269.
Bring next digit (2) of the dividend behind the 44 and repeat the process: 442 / 45

Advancing to step 6:
45 goes into 442 9 times with a remainder of 37.
Put 9 as the next digit of the answer. 
Result so far: 12859.0
Subtract 405 from 442 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 7:
370 divided by 45 is 8 with a remainder of 10.
Record the quotient 8 as the next digit in the result. 
Result so far: 12859.8
Subtracting 360 from 370 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.

Let's proceed to step 8:
45 goes into 100 2 times with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 12859.82
If we subtract 90 from 100, we get 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 9:
When dividing 100 by 45, we get 2 with a remainder of 10.
The number 2 becomes the next digit in our result. 
Result so far: 12859.822
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

After the division, we end up with 12859.822 and a remainder of 0.001.