Meanwhile, Cut 1/2-inch slice off bottom of pineapple, cut into quarters lengthwise, cutting through green top. Using small sharp knife, remove fruit without piercing through rind, leaving 1/2-inch-thick shell. Turn shells upside down on paper towel-lined pan to drain. Trim cores from pineapple quarters; cut fruit into 3/4-inch cubes. In large bowl toss pineapple, papaya and mango.