What is the sum of households that makes a median household income of $44,718?
CREATE TABLE "michigan_counties_by_per_capita_income" (
  "county" text,
  "per_capita_income" text,
  "median_household_income" text,
  "median_family_income" text,
  "population" real,
  "number_of_households" real
);
SELECT SUM("number_of_households") FROM "michigan_counties_by_per_capita_income" WHERE "median_household_income"='$44,718';