We look at the division of 5176708 by 391 
The aim is to understand the frequency of 391 in 5176708.

Step 1:
When dividing 5 by 391, we get 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 391

Going ahead to step 2:
391 can be fit into 51 0 times, resulting in a remainder of 51.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Take the next digit (7) from the dividend and append it to 51, then repeat: 517 / 391

On to step 3:
If we divide 517 by 391, we get 1 and a remainder of 126.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 391 from 517 to get 126.
Include the next digit (6) from the dividend after 126, then repeat: 1266 / 391

Advancing to step 4:
The number 391 fits into 1266 3 times, leaving a remainder of 93.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
Deduct 1173 from 1266 and we're left with 93.
Append the next digit (7) from the dividend to 93 and continue with: 937 / 391

Step 5:
391 goes into 937 2 times with a remainder of 155.
Use 2 as the next digit of our solution. 
Result so far: 132.0
Subtract 782 from 937 to get 155.
Take the next digit (0) from the dividend and append it to 155, then repeat: 1550 / 391

Step 6:
391 goes into 1550 3 times with a remainder of 377.
The next digit of our result is 3. 
Result so far: 1323.0
Subtracting 1173 from 1550 leaves us with 377.
Fetch the next digit (8) from the dividend, attach it to 377 and continue: 3778 / 391

Step 7:
3778 divided by 391 is 9 with a remainder of 259.
Use 9 as the next digit of our solution. 
Result so far: 13239.0
If we subtract 3519 from 3778, we get 259.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2590, and continue the process.

Let's proceed to step 8:
If we divide 2590 by 391, we get 6 and a remainder of 244.
Put 6 as the next digit of the answer. 
Result so far: 13239.6
Subtract 2346 from 2590 to get 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Let's proceed to step 9:
391 goes into 2440 6 times with a remainder of 94.
Record the quotient 6 as the next digit in the result. 
Result so far: 13239.66
If we subtract 2346 from 2440, we get 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

The quotient of the division is 13239.66, and the remainder is 0.094.