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Use something like this, using and array named C[] to keep track of your counter.

sort -t\; -k1,1 -k2,2r -k4,4r infile | awk -F\; '!($1$2 in A) { print $0 ";Try-" ++C[$1]; A[$1$2] }'

Sorry, should have checked my sort parameters the 4th field was supposed to be sorted in descending order to do the sort needs the r flag (not d) so your correct answers are:
sort -t\; -k1,1 -k4,4r...