Pineapple/Grapefruit Punch

1 (46oz) can pineapple juice

1 (46oz) can grapefruit juice

1 (12oz) can frozen orange juice

1 cup sugar

2 quarts ginger ale

Combine all ingredients in a 1 gallon container and add water to fill. Freeze. Remove from freezer 20 minutes before serving. Add ginger ale.