We look at the division of 87587121 by 304 
The aim is to understand the frequency of 304 in 87587121.

Advancing to step 1:
304 can be fit into 8 0 times, resulting in a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 304

Step 2:
304 goes into 87 0 times with a remainder of 87.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 87, we get 87.
Bring next digit (5) of the dividend behind the 87 and repeat the process: 875 / 304

Moving on to step 3:
875 divided by 304 is 2 with a remainder of 267.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 608 from 875 and we're left with 267.
Append the next digit (8) from the dividend to 267 and continue with: 2678 / 304

Step 4:
If we divide 2678 by 304, we get 8 and a remainder of 246.
Record the quotient 8 as the next digit in the result. 
Result so far: 28.0
Deduct 2432 from 2678 and we're left with 246.
Bring next digit (7) of the dividend behind the 246 and repeat the process: 2467 / 304

On to step 5:
When dividing 2467 by 304, we get 8 with a remainder of 35.
Write down 8 as next digit of the result. 
Result so far: 288.0
Deduct 2432 from 2467 and we're left with 35.
Grab the next digit (1) from the dividend, add it to 35, then carry on: 351 / 304

Step 6:
351 divided by 304 is 1 with a remainder of 47.
Write down 1 as next digit of the result. 
Result so far: 2881.0
Subtract 304 from 351 to get 47.
Bring next digit (2) of the dividend behind the 47 and repeat the process: 472 / 304

Advancing to step 7:
When dividing 472 by 304, we get 1 with a remainder of 168.
Put 1 as the next digit of the answer. 
Result so far: 28811.0
Subtract 304 from 472 to get 168.
Bring next digit (1) of the dividend behind the 168 and repeat the process: 1681 / 304

Let's proceed to step 8:
If we divide 1681 by 304, we get 5 and a remainder of 161.
The number 5 becomes the next digit in our result. 
Result so far: 288115.0
Subtracting 1520 from 1681 leaves us with 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

Advancing to step 9:
304 can be fit into 1610 5 times, resulting in a remainder of 90.
Use 5 as the next digit of our solution. 
Result so far: 288115.5
Subtract 1520 from 1610 to get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Going ahead to step 10:
304 goes into 900 2 times with a remainder of 292.
The number 2 becomes the next digit in our result. 
Result so far: 288115.52
If we subtract 608 from 900, we get 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Advancing to step 11:
If we divide 2920 by 304, we get 9 and a remainder of 184.
Record the quotient 9 as the next digit in the result. 
Result so far: 288115.529
If we subtract 2736 from 2920, we get 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Moving on to step 12:
When dividing 1840 by 304, we get 6 with a remainder of 16.
The next digit of our result is 6. 
Result so far: 288115.5296
Subtracting 1824 from 1840 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 13:
304 goes into 160 0 times with a remainder of 160.
Use 0 as the next digit of our solution. 
Result so far: 288115.5296
If we take 0 away from 160, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Advancing to step 14:
When dividing 1600 by 304, we get 5 with a remainder of 80.
The next digit of our result is 5. 
Result so far: 288115.529605
Subtracting 1520 from 1600 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 15:
The number 304 fits into 800 2 times, leaving a remainder of 192.
Write down 2 as next digit of the result. 
Result so far: 288115.5296052
If we subtract 608 from 800, we get 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Step 16:
304 goes into 1920 6 times with a remainder of 96.
Record the quotient 6 as the next digit in the result. 
Result so far: 288115.52960526
Subtracting 1824 from 1920 leaves us with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

The final result is 288115.52960526 with a remainder of 9.6e-08.