Step 1:
The first step to converting 687958645.6786 to a fraction is to re-write 687958645.6786 in the form p/q where p and q are both positive integers. To start with, 687958645.6786 can be written as simply 687958645.6786/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 687958645.6786, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 687958645.6786/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 687958645.6786/1 each by 10000:
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 687958645.6786 as a fraction:
687958645/1 / 1