Step 1:
The first step to converting 74.780120700164 to a fraction is to re-write 74.780120700164 in the form p/q where p and q are both positive integers. To start with, 74.780120700164 can be written as simply 74.780120700164/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 74.780120700164, which in this case is 12. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 74.780120700164/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 74.780120700164/1 each by 1000000000000:
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 74.780120700164 as a fraction:
10544/141 / 1