Step 1:
The first step to converting 42039.4665921 to a fraction is to re-write 42039.4665921 in the form p/q where p and q are both positive integers. To start with, 42039.4665921 can be written as simply 42039.4665921/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 42039.4665921, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 42039.4665921/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 42039.4665921/1 each by 10000000:
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 42039.4665921 as a fraction:
84079/2 / 1