Consider the following premises. There is at least one x_4 for which if x_4 were a mechanic, then x_4 is climbing a mountain. For all x_4, if x_4 were a server, then x_4 is climbing a mountain. For all x_4, if x_4 climbs a mountain, then x_4 is a mechanic. Can we infer the following from them? If we can, name the inference rule being used: For all x_4, the fact that x_4 were a server does not imply that x_4 is a mechanic.
That contradicts the premises. Therefore the answer is no.