This one is more straightforward. 1) React the ester methyl propionate with two equivalents of propylmagnesium bromide, followed by, 2) acid work-up with aqueous HCl. 
Steve
P.S. Remember,
RMgX + formaldehyde HCHO --> --> 1° alcohol
RMgX + aldehydes RCHO --> --> 2° alcohol
RMgX + ketone --> --> 3° alcohol
2RMgX + ester --> --> 3° alcohol
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