Data was collected on the number of customers shopping at an upscale ski boutique. The quarterly seasonal indexes are 1.46, 0.55, 0.72, and 1.27 for quarters 1, 2, 3, and 4, respectively. The estimated linear trend for sales in thousands of dollars is: Sales = $5,423 + 408(Q) where Q is the quarter number, with quarter 1 of 20X1 being designated 1 and increasing by 1 each quarter. What is the forecast value for the fourth quarter of 20X5?
a) $11,951
b) $13,583
c) $15,178
d) $17,250