We look at the division of 78791992 by 639 
The aim is to understand the frequency of 639 in 78791992.

Advancing to step 1:
When dividing 7 by 639, we get 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 639

Moving on to step 2:
639 goes into 78 0 times with a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 78, we end up with 78.
Bring next digit (7) of the dividend behind the 78 and repeat the process: 787 / 639

Let's proceed to step 3:
The number 639 fits into 787 1 times, leaving a remainder of 148.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 639 from 787 and we're left with 148.
Take the next digit (9) from the dividend and append it to 148, then repeat: 1489 / 639

Step 4:
When dividing 1489 by 639, we get 2 with a remainder of 211.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtract 1278 from 1489 to get 211.
Take the next digit (1) from the dividend and append it to 211, then repeat: 2111 / 639

Step 5:
639 can be fit into 2111 3 times, resulting in a remainder of 194.
Write down 3 as next digit of the result. 
Result so far: 123.0
If we take 1917 away from 2111, we end up with 194.
Grab the next digit (9) from the dividend, add it to 194, then carry on: 1949 / 639

Going ahead to step 6:
If we divide 1949 by 639, we get 3 and a remainder of 32.
The next digit of our result is 3. 
Result so far: 1233.0
If we subtract 1917 from 1949, we get 32.
Grab the next digit (9) from the dividend, add it to 32, then carry on: 329 / 639

Advancing to step 7:
If we divide 329 by 639, we get 0 and a remainder of 329.
The number 0 becomes the next digit in our result. 
Result so far: 12330.0
If we take 0 away from 329, we end up with 329.
Include the next digit (2) from the dividend after 329, then repeat: 3292 / 639

Step 8:
When dividing 3292 by 639, we get 5 with a remainder of 97.
Use 5 as the next digit of our solution. 
Result so far: 123305.0
Deduct 3195 from 3292 and we're left with 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

Advancing to step 9:
639 goes into 970 1 times with a remainder of 331.
Use 1 as the next digit of our solution. 
Result so far: 123305.1
If we subtract 639 from 970, we get 331.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3310, and continue the process.

Moving on to step 10:
3310 divided by 639 is 5 with a remainder of 115.
Write down 5 as next digit of the result. 
Result so far: 123305.15
Subtracting 3195 from 3310 leaves us with 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Let's proceed to step 11:
1150 divided by 639 is 1 with a remainder of 511.
Use 1 as the next digit of our solution. 
Result so far: 123305.151
Subtracting 639 from 1150 leaves us with 511.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5110, and continue the process.

Moving on to step 12:
5110 divided by 639 is 7 with a remainder of 637.
The number 7 becomes the next digit in our result. 
Result so far: 123305.1517
The remainder is 637 after subtracting 4473 from 5110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6370, and continue the process.

Step 13:
6370 divided by 639 is 9 with a remainder of 619.
Write down 9 as next digit of the result. 
Result so far: 123305.15179
Deduct 5751 from 6370 and we're left with 619.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6190, and continue the process.

Step 14:
639 can be fit into 6190 9 times, resulting in a remainder of 439.
The next digit of our result is 9. 
Result so far: 123305.151799
Subtracting 5751 from 6190 leaves us with 439.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4390, and continue the process.

The final result is 123305.151799 with a remainder of 4.39e-05.