For the data in the following table, compute the additive quarterly seasonal forecast model for the number of passengers of the airline without trend. Round your values for the coefficients of the model to three decimal places.

Quarter Number of Passengers

$127,536$

$277,620$

$372,918$

$434,483$

$121,786$

$289,071$

$363,169$

$437,208$

$129,773$

$276,612$

$369,686$

$434,010$

$120,007$

$273,079$

$366,354$