David is participating in a 5-round coding competition, where each round is scored out of 100 points. His target is to achieve an average score of 90 points across all rounds. His scores for the first three rounds were 92, 85, and 88. He then completed the fourth round and realized he can still meet his goal. What is the lowest possible score he could have made on the fourth round?
80
82
85
88
90
