Step 1:
The first step to converting 15781.875 to a fraction is to re-write 15781.875 in the form p/q where p and q are both positive integers. To start with, 15781.875 can be written as simply 15781.875/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 15781.875, which in this case is 3. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 15781.875/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 15781.875/1 each by 1000:
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 15781.875 as a fraction:
126255/8 / 1