We look at the division of 19875524 by 907 
The aim is to understand the frequency of 907 in 19875524.

Advancing to step 1:
The number 907 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 907

Advancing to step 2:
907 can be fit into 19 0 times, resulting in a remainder of 19.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 19 and we're left with 19.
Append the next digit (8) from the dividend to 19 and continue with: 198 / 907

Going ahead to step 3:
907 can be fit into 198 0 times, resulting in a remainder of 198.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 198 after subtracting 0 from 198.
Append the next digit (7) from the dividend to 198 and continue with: 1987 / 907

Step 4:
If we divide 1987 by 907, we get 2 and a remainder of 173.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we subtract 1814 from 1987, we get 173.
Include the next digit (5) from the dividend after 173, then repeat: 1735 / 907

Let's proceed to step 5:
1735 divided by 907 is 1 with a remainder of 828.
Put 1 as the next digit of the answer. 
Result so far: 21.0
Subtracting 907 from 1735 leaves us with 828.
Grab the next digit (5) from the dividend, add it to 828, then carry on: 8285 / 907

Moving on to step 6:
The number 907 fits into 8285 9 times, leaving a remainder of 122.
Write down 9 as next digit of the result. 
Result so far: 219.0
Deduct 8163 from 8285 and we're left with 122.
Append the next digit (2) from the dividend to 122 and continue with: 1222 / 907

Step 7:
1222 divided by 907 is 1 with a remainder of 315.
Use 1 as the next digit of our solution. 
Result so far: 2191.0
If we take 907 away from 1222, we end up with 315.
Append the next digit (4) from the dividend to 315 and continue with: 3154 / 907

Let's proceed to step 8:
907 can be fit into 3154 3 times, resulting in a remainder of 433.
Write down 3 as next digit of the result. 
Result so far: 21913.0
The remainder is 433 after subtracting 2721 from 3154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4330, and continue the process.

Advancing to step 9:
If we divide 4330 by 907, we get 4 and a remainder of 702.
The number 4 becomes the next digit in our result. 
Result so far: 21913.4
The remainder is 702 after subtracting 3628 from 4330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7020, and continue the process.

Going ahead to step 10:
The number 907 fits into 7020 7 times, leaving a remainder of 671.
The next digit of our result is 7. 
Result so far: 21913.47
Subtracting 6349 from 7020 leaves us with 671.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6710, and continue the process.

Let's proceed to step 11:
If we divide 6710 by 907, we get 7 and a remainder of 361.
Record the quotient 7 as the next digit in the result. 
Result so far: 21913.477
Subtracting 6349 from 6710 leaves us with 361.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3610, and continue the process.

The final outcome is 21913.477, with a leftover of 0.0361.