Who is 4th in line to the British Throne?
Princess Charlotte of Cambridge.
The order is such:
(1) The Prince Charles, Prince of Wales (b. 1948)
(2) Prince William, Duke of Cambridge (b. 1982)
(3) Prince George of Cambridge (b. 2013)
(4) Princess Charlotte of Cambridge (b. 2015)
(5) Prince Henry of Wales ( Harry ) (b. 1984)