Wall Street extended a rally into a fourth session on Wednesday, led by Apple, chipmakers and other trade-sensitive stocks after signs of progress in trade talks between the United States and China. The benchmark S&P 500 is up about 10 percent from a 20-month low it touched around Christmas, boosted by hopes for a deal between the world’s two largest economies, which eased some worries over the impact of the trade spat on global growth. Market participants were also e