Larsen amp; Toubro today posted a 22 per cent year-on-year growth in profit after tax to Rs 992 crore for the third quarter of the current fiscal. Lamp;T had registered a Rs 841 crore net pro fit in the October-December quarter of the previous fiscal,it said in a statement. Lamp;Ts gross revenue grew to Rs 14,155 crore in the reporting quarter,a 23 per cent increase from Rs 11,492 crore in the year-ago period.