Dow Jones industrial average up 24.28 points, closing at 3784.57 . . . N.Y.S.E.'s composite index gained 1.73, to 256.25 . . . NASDAQ stock rose 2.75, to 735.64 . . . American Stock Exchange rose 0.34, to 443.66 . . . Gold gained $0.50, to $377.70, on the Commodity Exchange in New York . . . The 30-year Treasury bond closed with a yield of 7.50 percent, even with late Tuesday's rate.