We're dividing 5398812 by 686 
The aim is to understand the frequency of 686 in 5398812.

On to step 1:
686 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Fetch the next digit (3) from the dividend, attach it to 5 and continue: 53 / 686

Let's proceed to step 2:
686 can be fit into 53 0 times, resulting in a remainder of 53.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 53, we get 53.
Fetch the next digit (9) from the dividend, attach it to 53 and continue: 539 / 686

On to step 3:
The number 686 fits into 539 0 times, leaving a remainder of 539.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 539 to get 539.
Append the next digit (8) from the dividend to 539 and continue with: 5398 / 686

Moving on to step 4:
The number 686 fits into 5398 7 times, leaving a remainder of 596.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we take 4802 away from 5398, we end up with 596.
Take the next digit (8) from the dividend and append it to 596, then repeat: 5968 / 686

Let's proceed to step 5:
5968 divided by 686 is 8 with a remainder of 480.
The number 8 becomes the next digit in our result. 
Result so far: 78.0
If we take 5488 away from 5968, we end up with 480.
Append the next digit (1) from the dividend to 480 and continue with: 4801 / 686

Advancing to step 6:
686 can be fit into 4801 6 times, resulting in a remainder of 685.
Put 6 as the next digit of the answer. 
Result so far: 786.0
The remainder is 685 after subtracting 4116 from 4801.
Fetch the next digit (2) from the dividend, attach it to 685 and continue: 6852 / 686

Going ahead to step 7:
6852 divided by 686 is 9 with a remainder of 678.
Record the quotient 9 as the next digit in the result. 
Result so far: 7869.0
Subtract 6174 from 6852 to get 678.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6780, and continue the process.

Moving on to step 8:
The number 686 fits into 6780 9 times, leaving a remainder of 606.
Record the quotient 9 as the next digit in the result. 
Result so far: 7869.9
If we subtract 6174 from 6780, we get 606.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6060, and continue the process.

Moving on to step 9:
686 goes into 6060 8 times with a remainder of 572.
Put 8 as the next digit of the answer. 
Result so far: 7869.98
Subtract 5488 from 6060 to get 572.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5720, and continue the process.

Advancing to step 10:
The number 686 fits into 5720 8 times, leaving a remainder of 232.
Put 8 as the next digit of the answer. 
Result so far: 7869.988
Subtracting 5488 from 5720 leaves us with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

The final outcome is 7869.988, with a leftover of 0.0232.