67238734 divided by 409 
The aim is to understand the frequency of 409 in 67238734.

Going ahead to step 1:
When dividing 6 by 409, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (7) from the dividend and append it to 6, then repeat: 67 / 409

Step 2:
If we divide 67 by 409, we get 0 and a remainder of 67.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 67 to get 67.
Append the next digit (2) from the dividend to 67 and continue with: 672 / 409

Step 3:
409 can be fit into 672 1 times, resulting in a remainder of 263.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 409 from 672 leaves us with 263.
Take the next digit (3) from the dividend and append it to 263, then repeat: 2633 / 409

Let's proceed to step 4:
The number 409 fits into 2633 6 times, leaving a remainder of 179.
Use 6 as the next digit of our solution. 
Result so far: 16.0
If we subtract 2454 from 2633, we get 179.
Bring next digit (8) of the dividend behind the 179 and repeat the process: 1798 / 409

Advancing to step 5:
If we divide 1798 by 409, we get 4 and a remainder of 162.
The next digit of our result is 4. 
Result so far: 164.0
If we subtract 1636 from 1798, we get 162.
Take the next digit (7) from the dividend and append it to 162, then repeat: 1627 / 409

Going ahead to step 6:
When dividing 1627 by 409, we get 3 with a remainder of 400.
Put 3 as the next digit of the answer. 
Result so far: 1643.0
If we take 1227 away from 1627, we end up with 400.
Grab the next digit (3) from the dividend, add it to 400, then carry on: 4003 / 409

Going ahead to step 7:
When dividing 4003 by 409, we get 9 with a remainder of 322.
The number 9 becomes the next digit in our result. 
Result so far: 16439.0
Subtract 3681 from 4003 to get 322.
Grab the next digit (4) from the dividend, add it to 322, then carry on: 3224 / 409

Moving on to step 8:
409 goes into 3224 7 times with a remainder of 361.
Use 7 as the next digit of our solution. 
Result so far: 164397.0
Deduct 2863 from 3224 and we're left with 361.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3610, and continue the process.

Moving on to step 9:
3610 divided by 409 is 8 with a remainder of 338.
Write down 8 as next digit of the result. 
Result so far: 164397.8
The remainder is 338 after subtracting 3272 from 3610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3380, and continue the process.

On to step 10:
409 goes into 3380 8 times with a remainder of 108.
The next digit of our result is 8. 
Result so far: 164397.88
Deduct 3272 from 3380 and we're left with 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

The final outcome is 164397.88, with a leftover of 0.108.