We're dividing 554398 by 7 
The aim is to understand the frequency of 7 in 554398.

Let's proceed to step 1:
When dividing 5 by 7, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Fetch the next digit (5) from the dividend, attach it to 5 and continue: 55 / 7

Step 2:
7 goes into 55 7 times with a remainder of 6.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Subtracting 49 from 55 leaves us with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 7

Step 3:
64 divided by 7 is 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 79.0
The remainder is 1 after subtracting 63 from 64.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 7

Moving on to step 4:
13 divided by 7 is 1 with a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 791.0
Subtract 7 from 13 to get 6.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 7

Let's proceed to step 5:
The number 7 fits into 69 9 times, leaving a remainder of 6.
Put 9 as the next digit of the answer. 
Result so far: 7919.0
If we subtract 63 from 69, we get 6.
Take the next digit (8) from the dividend and append it to 6, then repeat: 68 / 7

Step 6:
The number 7 fits into 68 9 times, leaving a remainder of 5.
Put 9 as the next digit of the answer. 
Result so far: 79199.0
If we subtract 63 from 68, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 7:
7 can be fit into 50 7 times, resulting in a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 79199.7
If we take 49 away from 50, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 8:
When dividing 10 by 7, we get 1 with a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 79199.71
The remainder is 3 after subtracting 7 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 9:
If we divide 30 by 7, we get 4 and a remainder of 2.
The next digit of our result is 4. 
Result so far: 79199.714
If we subtract 28 from 30, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 10:
If we divide 20 by 7, we get 2 and a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 79199.7142
Subtracting 14 from 20 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 11:
When dividing 60 by 7, we get 8 with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 79199.71428
If we subtract 56 from 60, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 12:
7 can be fit into 40 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 79199.714285
If we subtract 35 from 40, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 13:
7 goes into 50 7 times with a remainder of 1.
Record the quotient 7 as the next digit in the result. 
Result so far: 79199.7142857
Subtract 49 from 50 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 14:
7 can be fit into 10 1 times, resulting in a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 79199.71428571
Subtract 7 from 10 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final outcome is 79199.71428571, with a leftover of 3e-09.