Here are the data for the past 21 months for actual sales of a particular product: January February March April May June July August September October November December LAST YEAR 300 440 465 505 430 440 455 320 375 555 610 518 THIS YEAR 280 345 350 440 455 375 370 270 355 Develop a forecast for the fourth quarter using a three-quarter, weighted moving average. Weight the most recent quarter 0.50, the second most recent 0.25, and the third 0.25. Solve the problem using quarters, as opposed to forecasting separate months. (Round your answer to 2 decimal places.)