Drain pineapple, reserving juice. Combine pineapple, bananas, grapes, oranges and apples in a large bowl; set aside.
In a saucepan, combine sugar and cornstarch. Add the orange juice, lemon juice and reserved pineapple juice; stir until smooth. Bring to a boil; reduce heat. Cook and stir for 2 minutes. Pour over fruit; mix gently. Cover and refrigerate until serving.
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