You are given the following quarterly demand history for electric vehicles at a local Tesla dealership.

Compute the double exponential $($trend$-$adjusted$)$ exponential smoothing forecast for Period $7$ with

$=0\mathrm{.}2$ and $=0\mathrm{.}4.$

Assume you know the level and trend components for Period $5$ to be $L_5=1,430$ and $T_5=126.$

Rounding instructions

Carry calculations to three decimal places.

Enter your final answer rounded to one decimal place.