We look at the division of 26415444 by 409 
The aim is to understand the frequency of 409 in 26415444.

Step 1:
409 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 409

On to step 2:
409 goes into 26 0 times with a remainder of 26.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 26 to get 26.
Include the next digit (4) from the dividend after 26, then repeat: 264 / 409

Advancing to step 3:
If we divide 264 by 409, we get 0 and a remainder of 264.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 264 and we're left with 264.
Fetch the next digit (1) from the dividend, attach it to 264 and continue: 2641 / 409

On to step 4:
409 goes into 2641 6 times with a remainder of 187.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we take 2454 away from 2641, we end up with 187.
Append the next digit (5) from the dividend to 187 and continue with: 1875 / 409

Advancing to step 5:
409 can be fit into 1875 4 times, resulting in a remainder of 239.
The next digit of our result is 4. 
Result so far: 64.0
Deduct 1636 from 1875 and we're left with 239.
Append the next digit (4) from the dividend to 239 and continue with: 2394 / 409

On to step 6:
409 can be fit into 2394 5 times, resulting in a remainder of 349.
Put 5 as the next digit of the answer. 
Result so far: 645.0
Deduct 2045 from 2394 and we're left with 349.
Take the next digit (4) from the dividend and append it to 349, then repeat: 3494 / 409

Going ahead to step 7:
When dividing 3494 by 409, we get 8 with a remainder of 222.
Record the quotient 8 as the next digit in the result. 
Result so far: 6458.0
Subtracting 3272 from 3494 leaves us with 222.
Take the next digit (4) from the dividend and append it to 222, then repeat: 2224 / 409

Let's proceed to step 8:
409 can be fit into 2224 5 times, resulting in a remainder of 179.
The next digit of our result is 5. 
Result so far: 64585.0
Subtract 2045 from 2224 to get 179.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1790, and continue the process.

Advancing to step 9:
The number 409 fits into 1790 4 times, leaving a remainder of 154.
Put 4 as the next digit of the answer. 
Result so far: 64585.4
If we take 1636 away from 1790, we end up with 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Advancing to step 10:
409 can be fit into 1540 3 times, resulting in a remainder of 313.
Put 3 as the next digit of the answer. 
Result so far: 64585.43
Subtracting 1227 from 1540 leaves us with 313.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3130, and continue the process.

Moving on to step 11:
409 can be fit into 3130 7 times, resulting in a remainder of 267.
The next digit of our result is 7. 
Result so far: 64585.437
Deduct 2863 from 3130 and we're left with 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

Advancing to step 12:
2670 divided by 409 is 6 with a remainder of 216.
The next digit of our result is 6. 
Result so far: 64585.4376
Subtract 2454 from 2670 to get 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Step 13:
When dividing 2160 by 409, we get 5 with a remainder of 115.
The number 5 becomes the next digit in our result. 
Result so far: 64585.43765
Subtracting 2045 from 2160 leaves us with 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

On to step 14:
1150 divided by 409 is 2 with a remainder of 332.
Use 2 as the next digit of our solution. 
Result so far: 64585.437652
Subtracting 818 from 1150 leaves us with 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

Advancing to step 15:
The number 409 fits into 3320 8 times, leaving a remainder of 48.
Use 8 as the next digit of our solution. 
Result so far: 64585.4376528
Subtract 3272 from 3320 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 16:
409 goes into 480 1 times with a remainder of 71.
The next digit of our result is 1. 
Result so far: 64585.43765281
If we subtract 409 from 480, we get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

The final result is 64585.43765281 with a remainder of 7.1e-08.