In the training set below, what is $x_4^{(3)}?$ Please type in the number below $($this is an integer such as $123,$ no decimal points$)$:

$\backslash$table$[[$Size in feet ${?}^2,$Number of bedrooms,Number of floors,Age of home in years,Price $($$$)$ in $$1000\text{'}$s$],[x_1,x_2,x_3,x_4,],[2104,5,1,45,460],[1416,3,2,40,232],[1534,3,2,30,315],[852,2,1,36,178],[...,...,...,...,...]]$