Develop a $4-$month moving average $($MVA$)$ forecast. What is the forecast for December for a $4-$month MVA?

MONTH VALUE

JANUARY $74$

FEBRUARY $76$

MARCH $83$

APRIL $87$

MAY $88$

JUNE $85$

JULY $81$

AUGUST $82$

SEPTEMBER $80$

OCTOBER $78$

NOVEMBER $76$

DECEMBER