Step 1:
The first step to converting 171990616.28378 to a fraction is to re-write 171990616.28378 in the form p/q where p and q are both positive integers. To start with, 171990616.28378 can be written as simply 171990616.28378/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 171990616.28378, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 171990616.28378/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 171990616.28378/1 each by 100000:
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 171990616.28378 as a fraction:
171990616/1 / 1