here are the data for the past $21$ months for actual sales of a particual product: 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 THIS YEAR $325260440380450370440420380440460360410375370300345380510560540$ Develop a forecast for the fourth quarter using a three$-$quarter weighted moving average. Weight the cent quarter $0\mathrm{.}50,$ the second most recent $0\mathrm{.}25,$ and the third $0\mathrm{.}25.$ Solve the problem using quarters, as opposed to forecasting separate months. $($Round your answer to $2$ decimal places.$)$ Forecast for the fourth quarter