We're dividing 73421 by 87 
The aim is to understand the frequency of 87 in 73421.

Let's proceed to step 1:
87 goes into 7 0 times with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Grab the next digit (3) from the dividend, add it to 7, then carry on: 73 / 87

Going ahead to step 2:
The number 87 fits into 73 0 times, leaving a remainder of 73.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 73 leaves us with 73.
Include the next digit (4) from the dividend after 73, then repeat: 734 / 87

Going ahead to step 3:
87 can be fit into 734 8 times, resulting in a remainder of 38.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtract 696 from 734 to get 38.
Include the next digit (2) from the dividend after 38, then repeat: 382 / 87

On to step 4:
The number 87 fits into 382 4 times, leaving a remainder of 34.
Write down 4 as next digit of the result. 
Result so far: 84.0
Subtract 348 from 382 to get 34.
Grab the next digit (1) from the dividend, add it to 34, then carry on: 341 / 87

Advancing to step 5:
341 divided by 87 is 3 with a remainder of 80.
Use 3 as the next digit of our solution. 
Result so far: 843.0
Subtract 261 from 341 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 6:
If we divide 800 by 87, we get 9 and a remainder of 17.
The next digit of our result is 9. 
Result so far: 843.9
Subtracting 783 from 800 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 7:
When dividing 170 by 87, we get 1 with a remainder of 83.
The number 1 becomes the next digit in our result. 
Result so far: 843.91
Subtracting 87 from 170 leaves us with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Moving on to step 8:
When dividing 830 by 87, we get 9 with a remainder of 47.
The next digit of our result is 9. 
Result so far: 843.919
Subtracting 783 from 830 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 9:
The number 87 fits into 470 5 times, leaving a remainder of 35.
The next digit of our result is 5. 
Result so far: 843.9195
The remainder is 35 after subtracting 435 from 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 10:
When dividing 350 by 87, we get 4 with a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 843.91954
Deduct 348 from 350 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 11:
The number 87 fits into 20 0 times, leaving a remainder of 20.
The next digit of our result is 0. 
Result so far: 843.91954
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 12:
If we divide 200 by 87, we get 2 and a remainder of 26.
Put 2 as the next digit of the answer. 
Result so far: 843.9195402
If we take 174 away from 200, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 13:
260 divided by 87 is 2 with a remainder of 86.
The number 2 becomes the next digit in our result. 
Result so far: 843.91954022
Subtract 174 from 260 to get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

The final outcome is 843.91954022, with a leftover of 8.6e-08.