578552 divided by 12 
The aim is to understand the frequency of 12 in 578552.

Going ahead to step 1:
When dividing 5 by 12, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Append the next digit (7) from the dividend to 5 and continue with: 57 / 12

On to step 2:
57 divided by 12 is 4 with a remainder of 9.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtract 48 from 57 to get 9.
Take the next digit (8) from the dividend and append it to 9, then repeat: 98 / 12

Going ahead to step 3:
The number 12 fits into 98 8 times, leaving a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 48.0
Deduct 96 from 98 and we're left with 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 12

Let's proceed to step 4:
If we divide 25 by 12, we get 2 and a remainder of 1.
Write down 2 as next digit of the result. 
Result so far: 482.0
Deduct 24 from 25 and we're left with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 12

Moving on to step 5:
If we divide 15 by 12, we get 1 and a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 4821.0
If we subtract 12 from 15, we get 3.
Bring next digit (2) of the dividend behind the 3 and repeat the process: 32 / 12

Moving on to step 6:
The number 12 fits into 32 2 times, leaving a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 48212.0
Deduct 24 from 32 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 7:
If we divide 80 by 12, we get 6 and a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 48212.6
Subtracting 72 from 80 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 8:
The number 12 fits into 80 6 times, leaving a remainder of 8.
The next digit of our result is 6. 
Result so far: 48212.66
Deduct 72 from 80 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 48212.66, with a leftover of 0.008.