Step 1:
The first step to converting 690210.5455854 to a fraction is to re-write 690210.5455854 in the form p/q where p and q are both positive integers. To start with, 690210.5455854 can be written as simply 690210.5455854/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 690210.5455854, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 690210.5455854/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 690210.5455854/1 each by 10000000:
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 690210.5455854 as a fraction:
690210/1 / 1