We look at the division of 7301887 by 609 
The aim is to understand the frequency of 609 in 7301887.

Going ahead to step 1:
609 goes into 7 0 times with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 609

On to step 2:
609 goes into 73 0 times with a remainder of 73.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 73, we get 73.
Bring next digit (0) of the dividend behind the 73 and repeat the process: 730 / 609

Step 3:
730 divided by 609 is 1 with a remainder of 121.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 609 away from 730, we end up with 121.
Bring next digit (1) of the dividend behind the 121 and repeat the process: 1211 / 609

On to step 4:
The number 609 fits into 1211 1 times, leaving a remainder of 602.
The next digit of our result is 1. 
Result so far: 11.0
Deduct 609 from 1211 and we're left with 602.
Grab the next digit (8) from the dividend, add it to 602, then carry on: 6028 / 609

Moving on to step 5:
The number 609 fits into 6028 9 times, leaving a remainder of 547.
Use 9 as the next digit of our solution. 
Result so far: 119.0
Subtract 5481 from 6028 to get 547.
Grab the next digit (8) from the dividend, add it to 547, then carry on: 5478 / 609

Going ahead to step 6:
609 goes into 5478 8 times with a remainder of 606.
Put 8 as the next digit of the answer. 
Result so far: 1198.0
If we take 4872 away from 5478, we end up with 606.
Bring next digit (7) of the dividend behind the 606 and repeat the process: 6067 / 609

Step 7:
609 can be fit into 6067 9 times, resulting in a remainder of 586.
Write down 9 as next digit of the result. 
Result so far: 11989.0
Subtracting 5481 from 6067 leaves us with 586.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5860, and continue the process.

Advancing to step 8:
5860 divided by 609 is 9 with a remainder of 379.
The next digit of our result is 9. 
Result so far: 11989.9
The remainder is 379 after subtracting 5481 from 5860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3790, and continue the process.

Let's proceed to step 9:
The number 609 fits into 3790 6 times, leaving a remainder of 136.
Write down 6 as next digit of the result. 
Result so far: 11989.96
Subtracting 3654 from 3790 leaves us with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Advancing to step 10:
The number 609 fits into 1360 2 times, leaving a remainder of 142.
Record the quotient 2 as the next digit in the result. 
Result so far: 11989.962
The remainder is 142 after subtracting 1218 from 1360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Going ahead to step 11:
1420 divided by 609 is 2 with a remainder of 202.
Use 2 as the next digit of our solution. 
Result so far: 11989.9622
The remainder is 202 after subtracting 1218 from 1420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

The final outcome is 11989.9622, with a leftover of 0.00202.