U.S. stocks rose for the third straight week, sending the Standard & Poor’s 500 Index to its highest level since June 2008, as the Federal Reserve raised its forecast for economic growth and most companies reporting earnings topped estimates.Williams Cos. surged 13 percent, leading energy companies to the biggest advance among 10 S&P 500 industries, after the pipeline operator announced plans to spin off its oil and natural-gas exploration unit. Family Dollar Stores Inc. jumped 19 percent after investor Nelson Peltz offered to buy the retailer. Advanced Micro Devices Inc. gained 11 percent on speculation the semiconductor maker is an acquisition target.The S&P 500 rose 1 percent to 1,343.01. The index needs to advance 0.7 percent to 1,353.06 to complete a 100 percent rally from...