We look at the division of 45423165 by 373 
The aim is to understand the frequency of 373 in 45423165.

Step 1:
373 goes into 4 0 times with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 373

Moving on to step 2:
373 can be fit into 45 0 times, resulting in a remainder of 45.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 45 to get 45.
Take the next digit (4) from the dividend and append it to 45, then repeat: 454 / 373

Let's proceed to step 3:
454 divided by 373 is 1 with a remainder of 81.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 81 after subtracting 373 from 454.
Fetch the next digit (2) from the dividend, attach it to 81 and continue: 812 / 373

Moving on to step 4:
If we divide 812 by 373, we get 2 and a remainder of 66.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtract 746 from 812 to get 66.
Grab the next digit (3) from the dividend, add it to 66, then carry on: 663 / 373

Let's proceed to step 5:
663 divided by 373 is 1 with a remainder of 290.
Put 1 as the next digit of the answer. 
Result so far: 121.0
If we take 373 away from 663, we end up with 290.
Bring next digit (1) of the dividend behind the 290 and repeat the process: 2901 / 373

On to step 6:
2901 divided by 373 is 7 with a remainder of 290.
Write down 7 as next digit of the result. 
Result so far: 1217.0
Deduct 2611 from 2901 and we're left with 290.
Take the next digit (6) from the dividend and append it to 290, then repeat: 2906 / 373

Advancing to step 7:
If we divide 2906 by 373, we get 7 and a remainder of 295.
Record the quotient 7 as the next digit in the result. 
Result so far: 12177.0
If we subtract 2611 from 2906, we get 295.
Take the next digit (5) from the dividend and append it to 295, then repeat: 2955 / 373

Moving on to step 8:
2955 divided by 373 is 7 with a remainder of 344.
The number 7 becomes the next digit in our result. 
Result so far: 121777.0
Deduct 2611 from 2955 and we're left with 344.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

Step 9:
The number 373 fits into 3440 9 times, leaving a remainder of 83.
The number 9 becomes the next digit in our result. 
Result so far: 121777.9
The remainder is 83 after subtracting 3357 from 3440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Moving on to step 10:
The number 373 fits into 830 2 times, leaving a remainder of 84.
Put 2 as the next digit of the answer. 
Result so far: 121777.92
Deduct 746 from 830 and we're left with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

On to step 11:
When dividing 840 by 373, we get 2 with a remainder of 94.
The number 2 becomes the next digit in our result. 
Result so far: 121777.922
The remainder is 94 after subtracting 746 from 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

The final result is 121777.922 with a remainder of 0.0094.