SCHEMA:
CREATE TABLE table_name_58 (earnings___ INTEGER, country VARCHAR, score VARCHAR)
User Question:
What is the average earnings of a United States player who had a score of 72-68-74-72=286?


SELECT AVG(earnings___) AS $__ FROM table_name_58 WHERE country = "united states" AND score = 72 - 68 - 74 - 72 = 286