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awk -F"|" '{if ($3 > MX[$1 FS $2 FS $4]) MX[$1 FS $2 FS $4] = $3} END {for (m in MX) print m FS MX[m]}' file
0221|09|ccc|33.68
0221|09|aaa|44.33
0221|09|bbb|44.53

OR, if you want to...

Try this Third field move to last, if required in order can be done

awk -F"|" '(!a[$1"|"$2"|"$4]){a[$1"|"$2"|"$4]=$3;next}{if(a[$1"|"$2"|"$4] < $3){a[$1"|"$2"|"$4]=$3}}END{for( i in a) { print...