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

$\backslash$table$[[,$LAST YEAR,THIS YEAR$],[$January$,365,300],[$February$,455,375],[$March$,400,375],[$April$,430,455],[$May$,432,440],[$June$,505,380],[$July$,400,385],[$August$,320,305],[$September$,395,365],[$October$,500,],[$November$,590,],[$December$,490,]]$

Develop a forecast for the fourth quarter using a three$-$quarter, weighted moving average. Weight the most recent quarter $0\mathrm{.}50,$ the second most recent $0\mathrm{.}25,$ and the third $0\mathrm{.}25.$ Do the problem using quarters as opposed to forecasting separate months.

Note: Round your answer to $2$ decimal places.

Forecast for the fourth quarter