We look at the division of 91471428 by 523 
The aim is to understand the frequency of 523 in 91471428.

Let's proceed to step 1:
When dividing 9 by 523, we get 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 523

Moving on to step 2:
523 goes into 91 0 times with a remainder of 91.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 91 to get 91.
Include the next digit (4) from the dividend after 91, then repeat: 914 / 523

Going ahead to step 3:
914 divided by 523 is 1 with a remainder of 391.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 523 away from 914, we end up with 391.
Append the next digit (7) from the dividend to 391 and continue with: 3917 / 523

On to step 4:
523 goes into 3917 7 times with a remainder of 256.
Put 7 as the next digit of the answer. 
Result so far: 17.0
Subtract 3661 from 3917 to get 256.
Grab the next digit (1) from the dividend, add it to 256, then carry on: 2561 / 523

Moving on to step 5:
2561 divided by 523 is 4 with a remainder of 469.
Record the quotient 4 as the next digit in the result. 
Result so far: 174.0
If we take 2092 away from 2561, we end up with 469.
Include the next digit (4) from the dividend after 469, then repeat: 4694 / 523

Advancing to step 6:
523 can be fit into 4694 8 times, resulting in a remainder of 510.
The next digit of our result is 8. 
Result so far: 1748.0
The remainder is 510 after subtracting 4184 from 4694.
Include the next digit (2) from the dividend after 510, then repeat: 5102 / 523

Advancing to step 7:
The number 523 fits into 5102 9 times, leaving a remainder of 395.
Record the quotient 9 as the next digit in the result. 
Result so far: 17489.0
The remainder is 395 after subtracting 4707 from 5102.
Append the next digit (8) from the dividend to 395 and continue with: 3958 / 523

Step 8:
If we divide 3958 by 523, we get 7 and a remainder of 297.
Write down 7 as next digit of the result. 
Result so far: 174897.0
If we subtract 3661 from 3958, we get 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

On to step 9:
523 can be fit into 2970 5 times, resulting in a remainder of 355.
Use 5 as the next digit of our solution. 
Result so far: 174897.5
The remainder is 355 after subtracting 2615 from 2970.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3550, and continue the process.

On to step 10:
If we divide 3550 by 523, we get 6 and a remainder of 412.
The next digit of our result is 6. 
Result so far: 174897.56
Subtracting 3138 from 3550 leaves us with 412.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4120, and continue the process.

Let's proceed to step 11:
523 can be fit into 4120 7 times, resulting in a remainder of 459.
The next digit of our result is 7. 
Result so far: 174897.567
Deduct 3661 from 4120 and we're left with 459.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4590, and continue the process.

Going ahead to step 12:
523 can be fit into 4590 8 times, resulting in a remainder of 406.
Use 8 as the next digit of our solution. 
Result so far: 174897.5678
Subtract 4184 from 4590 to get 406.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4060, and continue the process.

Advancing to step 13:
4060 divided by 523 is 7 with a remainder of 399.
The next digit of our result is 7. 
Result so far: 174897.56787
If we subtract 3661 from 4060, we get 399.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3990, and continue the process.

Step 14:
523 goes into 3990 7 times with a remainder of 329.
Record the quotient 7 as the next digit in the result. 
Result so far: 174897.567877
The remainder is 329 after subtracting 3661 from 3990.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3290, and continue the process.

The final result is 174897.567877 with a remainder of 3.29e-05.