Feb 27 (Reuters) - Malaysia's Proton Holdings
* Says Q3 net loss at 74.67 million ringgit, compared with net profit of 10.33 mln ringgit in the year-ago period, due to declining car sales amid a slowing economy and negative consumer sentiment.
* Says appreciation in foreign currency rates to impact profitability going forward
* Proton says decline in care sales to continue due to slowing economic growth