What is the highest percent supporting prohibition when the number opposing is less than 2,978 and the percent opposing is less than 31.2 while the number supporting is less than 9,461?
CREATE TABLE "results_of_the_national_referendum_on_pr" (
  "jurisdiction" text,
  "for_prohibition" real,
  "percent_for" real,
  "against_prohibition" real,
  "percent_against" real
);
SELECT MAX("percent_for") FROM "results_of_the_national_referendum_on_pr" WHERE "against_prohibition"<'2,978' AND "percent_against"<31.2 AND "for_prohibition"<'9,461';