RIDDLE / PUZZLE HELP ASAP

In the festival of the hats, four people participated in an activity. They lined up in a straight line, all looking forward (so the 2nd participant can only see the first participant, and the third person is able to see both 1st and 2nd participants, but not the fourth participant). A hat was put on each of them, but they could NOT see what color of the hat that they were wearing themselves. The prize was to be given to the person who could guess his or her own hat’s color. All the information they had from the host was that there were 2 black hats and 2 red hats. Lastly, the fourth person who stood at the back was blind folded. Which participant (1st, 2nd, 3rd, or 4th ) was able to LOGICALLY figure out what color hat he or she was wearing without guessing? WHY?