Step 1:
The first step to converting 905.78910768012 to a fraction is to re-write 905.78910768012 in the form p/q where p and q are both positive integers. To start with, 905.78910768012 can be written as simply 905.78910768012/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 905.78910768012, which in this case is 11. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 905.78910768012/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 905.78910768012/1 each by 100000000000:
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 905.78910768012 as a fraction:
17210/19 / 1