I found two versions, one makes 24 servings and the other makes 40, although they both seem to have similar amounts of ingredients (could be different serving sizes).

Party Punch (24 servings)

3 cups warm water
2 cups sugar
3 ripe bananas, sliced
1 can (46 ounces) pineapple juice
1 1/2 cups orange juice
1/4 cup lemon juice
3 quarts ginger ale, chilled

Blend the water, sugar, and bananas in a blender or food processor until smooth. Pour into a large container. Add the juices. Mix well. Freeze, stirring occasionally, until slushy. Add ginger ale when ready to serve.

Tropical Punch (40 servings)

3 cups water
3/4 cup sugar
3 large ripe bananas
1 can (46 ounces) pineapple juice, chilled
1 1/2 cups orange juice
1/4 cup lemon juice
1 bottle (2 liters) ginger ale, chilled

Place water, sugar and banas in a blender; cover and process until smooth and sugar is dissolved. Pour into a large bowl; stir in remaining ingredients. Serve immediately.