We're dividing 43769644 by 409 
The aim is to understand the frequency of 409 in 43769644.

Moving on to step 1:
409 goes into 4 0 times with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 409

Advancing to step 2:
409 goes into 43 0 times with a remainder of 43.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 43, we end up with 43.
Append the next digit (7) from the dividend to 43 and continue with: 437 / 409

Let's proceed to step 3:
The number 409 fits into 437 1 times, leaving a remainder of 28.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 409 from 437, we get 28.
Take the next digit (6) from the dividend and append it to 28, then repeat: 286 / 409

Moving on to step 4:
The number 409 fits into 286 0 times, leaving a remainder of 286.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Deduct 0 from 286 and we're left with 286.
Take the next digit (9) from the dividend and append it to 286, then repeat: 2869 / 409

Moving on to step 5:
409 can be fit into 2869 7 times, resulting in a remainder of 6.
The next digit of our result is 7. 
Result so far: 107.0
If we take 2863 away from 2869, we end up with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 409

On to step 6:
If we divide 66 by 409, we get 0 and a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 1070.0
The remainder is 66 after subtracting 0 from 66.
Grab the next digit (4) from the dividend, add it to 66, then carry on: 664 / 409

Advancing to step 7:
664 divided by 409 is 1 with a remainder of 255.
Put 1 as the next digit of the answer. 
Result so far: 10701.0
Deduct 409 from 664 and we're left with 255.
Bring next digit (4) of the dividend behind the 255 and repeat the process: 2554 / 409

On to step 8:
2554 divided by 409 is 6 with a remainder of 100.
Use 6 as the next digit of our solution. 
Result so far: 107016.0
Subtract 2454 from 2554 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Step 9:
The number 409 fits into 1000 2 times, leaving a remainder of 182.
Write down 2 as next digit of the result. 
Result so far: 107016.2
Subtract 818 from 1000 to get 182.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

Let's proceed to step 10:
If we divide 1820 by 409, we get 4 and a remainder of 184.
Put 4 as the next digit of the answer. 
Result so far: 107016.24
If we take 1636 away from 1820, we end up with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Moving on to step 11:
409 goes into 1840 4 times with a remainder of 204.
The next digit of our result is 4. 
Result so far: 107016.244
If we subtract 1636 from 1840, we get 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

After the division, we end up with 107016.244 and a remainder of 0.0204.