What is the lowest Preliminary score of a contestant that has an Evening Gown score of 8.472?
CREATE TABLE "final_competition_scores" (
  "state" text,
  "preliminaries" real,
  "interview" real,
  "swimsuit" real,
  "evening_gown" real,
  "average" real
);
SELECT MIN("preliminaries") FROM "final_competition_scores" WHERE "evening_gown"=8.472;