could you show a step. by step on excel

The manager of Alaina's Garden Center must make the annual purchasing plans for rakes, gloves, and other gardening items. One of the items the company stocks is Fast-Grow, a liquid fertilizer. The sales of this item are seasonal, with peaks in the spring, summer, and fall months. Quarterly demand (in cases) for the past two years is as follows: Quarter 1 2 3 4 Total Year 1 38 351 275 207 871 Year 2 57 439 305 275 1,076 If the expected sales for Fast-Grow are 1,235 cases for year 3, use the multiplicative seasonal method to prepare a forecast for each quarter of the year. (Round all intermediate calculations to three decimal places.) The first quarter forecast is 60 cases. (Enter your response rounded to the nearest whole number.) The second quarter forecast is cases. (Enter your response rounded to the nearest whole number.)