1. **State the problem:** Yiorgos wants to estimate the cost to paint four walls of a room. Each wall is 28 meters wide and 9 meters tall. 2. **Calculate the total area to be painted:** Each wall area = width \times height = $28 \times 9 = 252$ square meters. There are 4 walls, so total area = $4 \times 252 = 1008$ square meters. 3. **Determine how many cans of paint are needed:** One can covers 333 square meters. Number of cans needed = $\frac{1008}{333} \approx 3.027$ cans. Since Yiorgos can buy exactly the amount he needs, he needs 3.027 cans. 4. **Calculate the total cost:** Cost per can = 34. Total cost = $3.027 \times 34 = 102.918$. 5. **Round the answer:** Rounded to the nearest whole dollar, the cost is 103. **Final answer:** Yiorgos will pay approximately 103 to paint the room.