0.00365747=1/x

Thanks Chris,  That is a really neat method!   Here is another method. 

Any number can be put over 1.  (If you divide any number by 1 its value does not change)  So

$$\\\frac{0.00365747}{1}=\frac{1}{x}\\\\ \mbox{Now you can turn both sides upside down (take the reciprocals)}\\\\ \frac{1}{0.00365747}=\frac{x}{1}\\\\ x=\frac{1}{0.00365747}\\\\$$

$${\frac{{\mathtt{1}}}{{\mathtt{0.003\: \!657\: \!47}}}} = {\mathtt{273.413\: \!042\: \!348\: \!946\: \!129\: \!4}}$$     

 I used the divide by sign to do this.   

Just type .00365747 into the calculator and hit the "1/x" key........this will give you your answer...