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The first problem is, that you calculated $v_i$ wrong right at the start. $$v_i = s_i^2 \mod n$$ This means: $$v_1 = 5^2 = 25 \mod 77$$ $$v_2 = 12^2 = 67 \mod 77$$ $$v_3 = 37^2 = 60 \mod 77$$ Then at the end you have: $$(x \cdot \prod_i v_i^{a_i}) = 67 \cdot 25 \cdot 1 \cdot 1 = 58 \mod 77$$



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