We're dividing 19876406 by 343 
The aim is to understand the frequency of 343 in 19876406.

On to step 1:
343 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 343

Moving on to step 2:
19 divided by 343 is 0 with a remainder of 19.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 19 leaves us with 19.
Grab the next digit (8) from the dividend, add it to 19, then carry on: 198 / 343

Moving on to step 3:
The number 343 fits into 198 0 times, leaving a remainder of 198.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 198 leaves us with 198.
Take the next digit (7) from the dividend and append it to 198, then repeat: 1987 / 343

Going ahead to step 4:
When dividing 1987 by 343, we get 5 with a remainder of 272.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we take 1715 away from 1987, we end up with 272.
Grab the next digit (6) from the dividend, add it to 272, then carry on: 2726 / 343

Advancing to step 5:
343 can be fit into 2726 7 times, resulting in a remainder of 325.
The next digit of our result is 7. 
Result so far: 57.0
If we subtract 2401 from 2726, we get 325.
Grab the next digit (4) from the dividend, add it to 325, then carry on: 3254 / 343

Step 6:
If we divide 3254 by 343, we get 9 and a remainder of 167.
Record the quotient 9 as the next digit in the result. 
Result so far: 579.0
Subtract 3087 from 3254 to get 167.
Take the next digit (0) from the dividend and append it to 167, then repeat: 1670 / 343

Moving on to step 7:
The number 343 fits into 1670 4 times, leaving a remainder of 298.
The number 4 becomes the next digit in our result. 
Result so far: 5794.0
Deduct 1372 from 1670 and we're left with 298.
Grab the next digit (6) from the dividend, add it to 298, then carry on: 2986 / 343

Advancing to step 8:
The number 343 fits into 2986 8 times, leaving a remainder of 242.
The next digit of our result is 8. 
Result so far: 57948.0
If we subtract 2744 from 2986, we get 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

Advancing to step 9:
When dividing 2420 by 343, we get 7 with a remainder of 19.
The next digit of our result is 7. 
Result so far: 57948.7
Subtract 2401 from 2420 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 10:
The number 343 fits into 190 0 times, leaving a remainder of 190.
Put 0 as the next digit of the answer. 
Result so far: 57948.7
If we subtract 0 from 190, we get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Step 11:
1900 divided by 343 is 5 with a remainder of 185.
Use 5 as the next digit of our solution. 
Result so far: 57948.705
Subtracting 1715 from 1900 leaves us with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Let's proceed to step 12:
When dividing 1850 by 343, we get 5 with a remainder of 135.
The number 5 becomes the next digit in our result. 
Result so far: 57948.7055
Subtract 1715 from 1850 to get 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

In conclusion, the division gives 57948.7055 with a balance of 0.00135.