We're dividing 17354399 by 261 
The aim is to understand the frequency of 261 in 17354399.

Moving on to step 1:
1 divided by 261 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 261

Step 2:
17 divided by 261 is 0 with a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 17 and we're left with 17.
Include the next digit (3) from the dividend after 17, then repeat: 173 / 261

Step 3:
261 can be fit into 173 0 times, resulting in a remainder of 173.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 173 after subtracting 0 from 173.
Include the next digit (5) from the dividend after 173, then repeat: 1735 / 261

On to step 4:
When dividing 1735 by 261, we get 6 with a remainder of 169.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Deduct 1566 from 1735 and we're left with 169.
Append the next digit (4) from the dividend to 169 and continue with: 1694 / 261

Step 5:
261 goes into 1694 6 times with a remainder of 128.
The number 6 becomes the next digit in our result. 
Result so far: 66.0
If we subtract 1566 from 1694, we get 128.
Bring next digit (3) of the dividend behind the 128 and repeat the process: 1283 / 261

Advancing to step 6:
1283 divided by 261 is 4 with a remainder of 239.
The number 4 becomes the next digit in our result. 
Result so far: 664.0
The remainder is 239 after subtracting 1044 from 1283.
Take the next digit (9) from the dividend and append it to 239, then repeat: 2399 / 261

Step 7:
If we divide 2399 by 261, we get 9 and a remainder of 50.
Write down 9 as next digit of the result. 
Result so far: 6649.0
Subtracting 2349 from 2399 leaves us with 50.
Include the next digit (9) from the dividend after 50, then repeat: 509 / 261

Moving on to step 8:
261 can be fit into 509 1 times, resulting in a remainder of 248.
Use 1 as the next digit of our solution. 
Result so far: 66491.0
Subtracting 261 from 509 leaves us with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Moving on to step 9:
2480 divided by 261 is 9 with a remainder of 131.
Put 9 as the next digit of the answer. 
Result so far: 66491.9
Subtract 2349 from 2480 to get 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Let's proceed to step 10:
The number 261 fits into 1310 5 times, leaving a remainder of 5.
The next digit of our result is 5. 
Result so far: 66491.95
Subtracting 1305 from 1310 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 11:
50 divided by 261 is 0 with a remainder of 50.
Use 0 as the next digit of our solution. 
Result so far: 66491.95
Subtracting 0 from 50 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 12:
When dividing 500 by 261, we get 1 with a remainder of 239.
Record the quotient 1 as the next digit in the result. 
Result so far: 66491.9501
The remainder is 239 after subtracting 261 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2390, and continue the process.

Let's proceed to step 13:
2390 divided by 261 is 9 with a remainder of 41.
Use 9 as the next digit of our solution. 
Result so far: 66491.95019
If we take 2349 away from 2390, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Let's proceed to step 14:
261 can be fit into 410 1 times, resulting in a remainder of 149.
Use 1 as the next digit of our solution. 
Result so far: 66491.950191
If we subtract 261 from 410, we get 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

Step 15:
The number 261 fits into 1490 5 times, leaving a remainder of 185.
Put 5 as the next digit of the answer. 
Result so far: 66491.9501915
The remainder is 185 after subtracting 1305 from 1490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Going ahead to step 16:
261 goes into 1850 7 times with a remainder of 23.
Write down 7 as next digit of the result. 
Result so far: 66491.95019157
The remainder is 23 after subtracting 1827 from 1850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

The final outcome is 66491.95019157, with a leftover of 2.3e-08.