CREATE TABLE table_30087 ("\\u2116" FLOAT, "#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

What episode number had US viewership of 4.87 million?
SELECT "\u2116" FROM table_30087 WHERE "U.S. viewers (million)" = '4.87'
SELECT "\u2116" FROM "table_30087" WHERE "U.S. viewers (million)" = '4.87'