Larsen & Toubro (L&T) Q3FY07 net profit has surged 32.6% to Rs 343.90 crore when compared with Rs 259.27 crore reported in Q3FY06.According to a release issued by L&T to the BSE today, the company's total income has increased 13.2% to Rs 4,246.35 crore for the quarter ended December 31, 2006 as against Rs 3,749.51 crore in the the quarter ended December 31, 2005.