Place pineapple and mango in a large bowl. Add sliced bananas. Drizzle lemon juice over the bananas and toss all the fruit lightly.
Separate each peeled orange into two halves. Lay halves flat-side down and cut into thin slices. Remove any seeds, then add to the bowl.
Stir together the orange juice and coconut milk. Pour over fruit. Add shredded coconut and toss the salad gently. Serve chilled.