54008704 ÷ 393 
The aim is to understand the frequency of 393 in 54008704.

Moving on to step 1:
The number 393 fits into 5 0 times, leaving a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Include the next digit (4) from the dividend after 5, then repeat: 54 / 393

Advancing to step 2:
The number 393 fits into 54 0 times, leaving a remainder of 54.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 54 after subtracting 0 from 54.
Grab the next digit (0) from the dividend, add it to 54, then carry on: 540 / 393

Advancing to step 3:
540 divided by 393 is 1 with a remainder of 147.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 393 from 540 to get 147.
Take the next digit (0) from the dividend and append it to 147, then repeat: 1470 / 393

Step 4:
1470 divided by 393 is 3 with a remainder of 291.
The next digit of our result is 3. 
Result so far: 13.0
If we subtract 1179 from 1470, we get 291.
Bring next digit (8) of the dividend behind the 291 and repeat the process: 2918 / 393

Step 5:
The number 393 fits into 2918 7 times, leaving a remainder of 167.
The next digit of our result is 7. 
Result so far: 137.0
If we take 2751 away from 2918, we end up with 167.
Append the next digit (7) from the dividend to 167 and continue with: 1677 / 393

Going ahead to step 6:
1677 divided by 393 is 4 with a remainder of 105.
Put 4 as the next digit of the answer. 
Result so far: 1374.0
The remainder is 105 after subtracting 1572 from 1677.
Fetch the next digit (0) from the dividend, attach it to 105 and continue: 1050 / 393

On to step 7:
When dividing 1050 by 393, we get 2 with a remainder of 264.
Write down 2 as next digit of the result. 
Result so far: 13742.0
Deduct 786 from 1050 and we're left with 264.
Fetch the next digit (4) from the dividend, attach it to 264 and continue: 2644 / 393

Let's proceed to step 8:
2644 divided by 393 is 6 with a remainder of 286.
The next digit of our result is 6. 
Result so far: 137426.0
Subtract 2358 from 2644 to get 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

Step 9:
2860 divided by 393 is 7 with a remainder of 109.
Use 7 as the next digit of our solution. 
Result so far: 137426.7
If we subtract 2751 from 2860, we get 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

On to step 10:
393 goes into 1090 2 times with a remainder of 304.
Use 2 as the next digit of our solution. 
Result so far: 137426.72
Deduct 786 from 1090 and we're left with 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Advancing to step 11:
393 can be fit into 3040 7 times, resulting in a remainder of 289.
The next digit of our result is 7. 
Result so far: 137426.727
The remainder is 289 after subtracting 2751 from 3040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2890, and continue the process.

Going ahead to step 12:
If we divide 2890 by 393, we get 7 and a remainder of 139.
Use 7 as the next digit of our solution. 
Result so far: 137426.7277
If we subtract 2751 from 2890, we get 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

The final result is 137426.7277 with a remainder of 0.00139.