Let's divide 1804790 by 409
The aim is to understand the frequency of 409 in 1804790.

Going ahead to step 1:
1 divided by 409 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 409

Going ahead to step 2:
If we divide 18 by 409, we get 0 and a remainder of 18.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 18, we get 18.
Bring next digit (0) of the dividend behind the 18 and repeat the process: 180 / 409

Moving on to step 3:
180 divided by 409 is 0 with a remainder of 180.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 180, we get 180.
Bring next digit (4) of the dividend behind the 180 and repeat the process: 1804 / 409

Let's proceed to step 4:
409 goes into 1804 4 times with a remainder of 168.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtracting 1636 from 1804 leaves us with 168.
Take the next digit (7) from the dividend and append it to 168, then repeat: 1687 / 409

Moving on to step 5:
The number 409 fits into 1687 4 times, leaving a remainder of 51.
Write down 4 as next digit of the result. 
Result so far: 44.0
If we take 1636 away from 1687, we end up with 51.
Take the next digit (9) from the dividend and append it to 51, then repeat: 519 / 409

On to step 6:
519 divided by 409 is 1 with a remainder of 110.
Write down 1 as next digit of the result. 
Result so far: 441.0
The remainder is 110 after subtracting 409 from 519.
Include the next digit (0) from the dividend after 110, then repeat: 1100 / 409

Step 7:
409 goes into 1100 2 times with a remainder of 282.
Record the quotient 2 as the next digit in the result. 
Result so far: 4412.0
Deduct 818 from 1100 and we're left with 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

On to step 8:
If we divide 2820 by 409, we get 6 and a remainder of 366.
The number 6 becomes the next digit in our result. 
Result so far: 4412.6
Subtract 2454 from 2820 to get 366.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

Let's proceed to step 9:
409 can be fit into 3660 8 times, resulting in a remainder of 388.
The number 8 becomes the next digit in our result. 
Result so far: 4412.68
The remainder is 388 after subtracting 3272 from 3660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

Advancing to step 10:
409 goes into 3880 9 times with a remainder of 199.
Put 9 as the next digit of the answer. 
Result so far: 4412.689
Subtract 3681 from 3880 to get 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Step 11:
409 can be fit into 1990 4 times, resulting in a remainder of 354.
Put 4 as the next digit of the answer. 
Result so far: 4412.6894
Deduct 1636 from 1990 and we're left with 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Advancing to step 12:
3540 divided by 409 is 8 with a remainder of 268.
Put 8 as the next digit of the answer. 
Result so far: 4412.68948
If we take 3272 away from 3540, we end up with 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Step 13:
2680 divided by 409 is 6 with a remainder of 226.
Write down 6 as next digit of the result. 
Result so far: 4412.689486
Deduct 2454 from 2680 and we're left with 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

Let's proceed to step 14:
409 goes into 2260 5 times with a remainder of 215.
The number 5 becomes the next digit in our result. 
Result so far: 4412.6894865
Deduct 2045 from 2260 and we're left with 215.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2150, and continue the process.

On to step 15:
When dividing 2150 by 409, we get 5 with a remainder of 105.
The next digit of our result is 5. 
Result so far: 4412.68948655
Deduct 2045 from 2150 and we're left with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

In conclusion, the division gives 4412.68948655 with a balance of 1.05e-07.