#### Answer

$760mm Hg = 1 atm$
$760 \div 1 \times 4.8 \div x$
$= 3648 mm Hg$

#### Work Step by Step

Since you are trying to find how many mmhg equals 4.8atm you will need to keep in mind $760mmhg=1atm$. You use stoichiometry by cross canceling out certain variables.
Therefore, you place 760 mm hg over one and place 4.8 over x then multiply so the atm are diagonal from each other they and will cancel out. Multiply what is left and you get 3648 mm hg.