CREATE TABLE table_25664518_4 (viewers__millions_ VARCHAR)

Who were the 3rd couple that were viewed by 4.89 million viewers?
SELECT 3 AS rd_couple FROM table_25664518_4 WHERE viewers__millions_ = "4.89"
SELECT 3 AS "rd_couple" FROM "table_25664518_4" WHERE "4.89" = "viewers__millions_"