***please help to solve using the Winters method only***

Using the Winters method please help to find the forecast three period ahead for the following. QUESTION 5 A company has experienced the following quarterly sales for the past eight quarters Quarter Demand Quarter Demand (year (year 1) 2) 1 10 5 12 2 22 6 26 3 26 7 30 4 19 8 22 Considering the following values for the intercept, slope, seasonal factors, and smoothing constants Go= 2.3362, So=29.36, C-3=0.5330, c.2-1.1752, C.1= 1.2825. Co=0.9363 a=0.2. v=0.1. B=0 Forecast three period ahead demand at time to (t=O=present, period 8), 12.4