Tokyo stocks pushed ahead for the fourth day as foreign investors began to bet that the economy was showing genuine signs of recovery. The forecast from Dell that analysts had underestimated the strength of its second-quarter sales and earnings lifted computer stocks in Tokyo, and the Nikkei 225 extended this week's rally with a 108.63 points gain to 11,847.32, taking its year's rise to more than 16%. Chips giant NEC led the charge with a gain of almost 5%, while Sony rose around 1%.