HELSINKI (Reuters) - Finnish engineering business Metso posted better than expected fourth-quarter results on Wednesday, helped by a strong performance from its minerals division, lifting the company's shares to a three-month high.New orders at the minerals unit grew 35 percent year on year to 714 million euros (627 million pounds), demonstrating a healthy market for mining equipment and beating analyst forecasts."We had a strong fourth quarter," Chief Executive Pekka Vauramo said in a..