Try this formula, which assumes that the four cells are a1:d1:
IF(COUNTBLANK(A1😃1)=3,IF(ISTEXT(A1)+OR(ISNUMBER(A1)),A1,IF(ISTEXT(B1)+OR(ISNUMBER(B1)),B1,IF(ISTEXT(C1)+OR(ISNUMBER(C1)),C1,IF(ISTEXT(D1)+OR(ISNUMBER(D1)),D1)))),IF(COUNTBLANK(A1😃1)>3,FALSE))