Step 1:
The first step to converting 166168.12742173 to a fraction is to re-write 166168.12742173 in the form p/q where p and q are both positive integers. To start with, 166168.12742173 can be written as simply 166168.12742173/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 166168.12742173, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 166168.12742173/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 166168.12742173/1 each by 100000000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 166168.12742173 as a fraction:
166168/1 / 1