That's hard to say, as angels have different personalities. They may get along fine, the larger may get aggressive towards the smaller two, or the smaller two may show aggression towards the newcomer. Pick up a divider before adding the new fish, anyone dealing with cichlids should have one.
Here's a standard stocking rate chart for angels. If you are keeping them long term, plan on 10 gallons per angel.
Newly free swimming fry 40 fry per gallon
Two week old fry 20 fry per gallon
Month old fry 10 fry per gallon
Pea size bodies 3 fish per gallon
Dime size bodies 2 fish per gallon
Nickel size bodies 1 fish per gallon
Quarter size bodies 1 fish per 2 gallons
Silver Dollar size bodies 1 fish per 3 gallons
Potential breeders 1 fish per 5 gallons
Show Specimens 1 fish per 10 gallons
One breeding pair 20 gallon high tank
