Step 1:
The first step to converting 41990.21378936 to a fraction is to re-write 41990.21378936 in the form p/q where p and q are both positive integers. To start with, 41990.21378936 can be written as simply 41990.21378936/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 41990.21378936, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 41990.21378936/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 41990.21378936/1 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 41990.21378936 as a fraction:
167961/4 / 1