Step 1:
The first step to converting 142172.29661218 to a fraction is to re-write 142172.29661218 in the form p/q where p and q are both positive integers. To start with, 142172.29661218 can be written as simply 142172.29661218/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 142172.29661218, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 142172.29661218/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 142172.29661218/1 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 142172.29661218 as a fraction:
426517/3 / 1