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=$B$2*((D2-$A$3)*(D2-$A$4)*(D2-$A$5))/(($A$2-$A$3)*($A$2-$A$4)*($A$2-$A$5)) + 
$B$3*((D2-$A$2)*(D2-$A$4)*(D2-$A$5))/(($A$3-$A$2)*($A$3-$A$4)*($A$3-$A$5)) + 
$B$4*((D2-$A$2)*(D2-$A$3)*(D2-$A$5))/(($A$4-$A$2)*($A$4-$A$3)*($A$4-$A$5)) + 
$B$5*((D2-$A$2)*(D2-$A$3)*(D2-$A$4))/(($A$5-$A$2)*($A$5-$A$3)*($A$5-$A$4))