You are almost correct, just few minor changes.
1 package orange jello
1 large carton cottage cheese, rinsed and drained
1 regular size can pineapple crushed and drained, save some liquid
1 can mandarin oranges dained
1 8 oz. carton coolwhip
Stir well till mixed. Judge how much coolwhip you need by taste. I use some of the pineapple juice to mix in with a cup or two of mini marshmellows, when marshmellows become soft stir them into the jellomix. Adjust taste and add more ingredients if needed. You can't fail.