We look at the division of 392574 by 84 
The aim is to understand the frequency of 84 in 392574.

Let's proceed to step 1:
When dividing 3 by 84, we get 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 84

Let's proceed to step 2:
39 divided by 84 is 0 with a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Fetch the next digit (2) from the dividend, attach it to 39 and continue: 392 / 84

On to step 3:
84 goes into 392 4 times with a remainder of 56.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 336 from 392, we get 56.
Take the next digit (5) from the dividend and append it to 56, then repeat: 565 / 84

Going ahead to step 4:
The number 84 fits into 565 6 times, leaving a remainder of 61.
The number 6 becomes the next digit in our result. 
Result so far: 46.0
Deduct 504 from 565 and we're left with 61.
Fetch the next digit (7) from the dividend, attach it to 61 and continue: 617 / 84

On to step 5:
84 can be fit into 617 7 times, resulting in a remainder of 29.
The next digit of our result is 7. 
Result so far: 467.0
Subtract 588 from 617 to get 29.
Append the next digit (4) from the dividend to 29 and continue with: 294 / 84

Let's proceed to step 6:
294 divided by 84 is 3 with a remainder of 42.
Put 3 as the next digit of the answer. 
Result so far: 4673.0
Subtract 252 from 294 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 7:
84 goes into 420 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 4673.5
Deduct 420 from 420 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
When dividing 0 by 84, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 4673.5
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
If we divide 0 by 84, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 4673.5
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 4673.5 with a remainder of 0.0.