Drain pineapple, reserving 3/4 cup juice. In a saucepan, combine sugar and cornstarch. Add pineapple juice, orange juice and lemon juice. Cook and stir over medium heat until thickened and bubbly; cook and stir 1 minute longer. Remove from the heat; set aside. In a bowl, combine pineapple chunks, oranges, apples and bananas. Pour warm sauce over the fruit; stir gently to coat. Cover and refrigerate.
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