You can use an IF construct like below which is simple but lengthy. =IF(K3<>"",K3,IF(H3<>"",H3,IF(F3<>"",F3,IF(D3<>"",D3,IF(B3<>"",B3,"")))))
If rest of the cells are always blank then you can also use which will be easier to extend if you have more columns: =IFERROR(LOOKUP(2,1/(B3:K3<>""),B3:K3),"")