12939015 divided by 74 
The aim is to understand the frequency of 74 in 12939015.

Step 1:
When dividing 1 by 74, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 74

Let's proceed to step 2:
The number 74 fits into 12 0 times, leaving a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Fetch the next digit (9) from the dividend, attach it to 12 and continue: 129 / 74

Let's proceed to step 3:
74 goes into 129 1 times with a remainder of 55.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 74 from 129 and we're left with 55.
Include the next digit (3) from the dividend after 55, then repeat: 553 / 74

Moving on to step 4:
The number 74 fits into 553 7 times, leaving a remainder of 35.
Put 7 as the next digit of the answer. 
Result so far: 17.0
If we take 518 away from 553, we end up with 35.
Fetch the next digit (9) from the dividend, attach it to 35 and continue: 359 / 74

On to step 5:
When dividing 359 by 74, we get 4 with a remainder of 63.
Use 4 as the next digit of our solution. 
Result so far: 174.0
Subtracting 296 from 359 leaves us with 63.
Fetch the next digit (0) from the dividend, attach it to 63 and continue: 630 / 74

Step 6:
630 divided by 74 is 8 with a remainder of 38.
Use 8 as the next digit of our solution. 
Result so far: 1748.0
Deduct 592 from 630 and we're left with 38.
Grab the next digit (1) from the dividend, add it to 38, then carry on: 381 / 74

Step 7:
74 can be fit into 381 5 times, resulting in a remainder of 11.
Put 5 as the next digit of the answer. 
Result so far: 17485.0
Subtract 370 from 381 to get 11.
Fetch the next digit (5) from the dividend, attach it to 11 and continue: 115 / 74

Step 8:
74 can be fit into 115 1 times, resulting in a remainder of 41.
Use 1 as the next digit of our solution. 
Result so far: 174851.0
The remainder is 41 after subtracting 74 from 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 9:
410 divided by 74 is 5 with a remainder of 40.
The number 5 becomes the next digit in our result. 
Result so far: 174851.5
If we subtract 370 from 410, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 10:
74 can be fit into 400 5 times, resulting in a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 174851.55
The remainder is 30 after subtracting 370 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final result is 174851.55 with a remainder of 0.03.