CREATE TABLE table_39478 ("County" TEXT, "Per capita income" TEXT, "Median household income" TEXT, "Median family income" TEXT, "Population" FLOAT, "Number of households" FLOAT)

What's the $51,914 median household income per capita?
SELECT "Per capita income" FROM table_39478 WHERE "Median household income" = '$51,914'
SELECT "Per capita income" FROM "table_39478" WHERE "Median household income" = '$51,914'