Here are the data for the past 21 months for actual sales of a particular product:

	LAST YEAR	THIS YEAR
January	320	295
February	380	370
March	420	362
April	425	465
May	440	430
June	475	375
July	440	375
August	310	315
September	375	385
October	540
November	575
December	555

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.

Note: Round your answer to 2 decimal places.