Two-wheeler major, Bajaj Auto on Thursday reported a quarterly profit after tax of 726 crore rupees, up 6 per cent compared to the same period last fiscal.Bajaj said growth in PAT was lower mainly on account of a forex loss of 95 crore rupees on valuation of forward contracts that have been charged to its profit and loss account. The company posted a record quarterly turnover of 5,342 crore rupees, up 21 per cent from the year-ago period.