What is the per capita income of the county with a median family income of $40,492?
CREATE TABLE "south_carolina_counties_ranked_by_per_ca" (
  "county" text,
  "per_capita_income" text,
  "median_household_income" text,
  "median_family_income" text,
  "population" real,
  "number_of_households" real
);
SELECT "per_capita_income" FROM "south_carolina_counties_ranked_by_per_ca" WHERE "median_family_income"='$40,492';