We're dividing 15051586 by 104 
The aim is to understand the frequency of 104 in 15051586.

Advancing to step 1:
When dividing 1 by 104, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 104

Step 2:
If we divide 15 by 104, we get 0 and a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Bring next digit (0) of the dividend behind the 15 and repeat the process: 150 / 104

Going ahead to step 3:
The number 104 fits into 150 1 times, leaving a remainder of 46.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 104 from 150 to get 46.
Append the next digit (5) from the dividend to 46 and continue with: 465 / 104

Advancing to step 4:
If we divide 465 by 104, we get 4 and a remainder of 49.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
The remainder is 49 after subtracting 416 from 465.
Fetch the next digit (1) from the dividend, attach it to 49 and continue: 491 / 104

On to step 5:
If we divide 491 by 104, we get 4 and a remainder of 75.
The next digit of our result is 4. 
Result so far: 144.0
Subtract 416 from 491 to get 75.
Include the next digit (5) from the dividend after 75, then repeat: 755 / 104

Going ahead to step 6:
When dividing 755 by 104, we get 7 with a remainder of 27.
Write down 7 as next digit of the result. 
Result so far: 1447.0
Subtract 728 from 755 to get 27.
Fetch the next digit (8) from the dividend, attach it to 27 and continue: 278 / 104

Step 7:
When dividing 278 by 104, we get 2 with a remainder of 70.
Use 2 as the next digit of our solution. 
Result so far: 14472.0
If we take 208 away from 278, we end up with 70.
Include the next digit (6) from the dividend after 70, then repeat: 706 / 104

Moving on to step 8:
The number 104 fits into 706 6 times, leaving a remainder of 82.
The next digit of our result is 6. 
Result so far: 144726.0
The remainder is 82 after subtracting 624 from 706.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Advancing to step 9:
104 goes into 820 7 times with a remainder of 92.
Record the quotient 7 as the next digit in the result. 
Result so far: 144726.7
The remainder is 92 after subtracting 728 from 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Moving on to step 10:
The number 104 fits into 920 8 times, leaving a remainder of 88.
The number 8 becomes the next digit in our result. 
Result so far: 144726.78
The remainder is 88 after subtracting 832 from 920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Moving on to step 11:
If we divide 880 by 104, we get 8 and a remainder of 48.
Put 8 as the next digit of the answer. 
Result so far: 144726.788
The remainder is 48 after subtracting 832 from 880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

The final outcome is 144726.788, with a leftover of 0.0048.