Finding the Third Proportional to 18,816 and 28,222.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,816 : 28,222.50 = 28,222.50 : x
2. Step 2: Convert to fraction form
   18,816/28,222.50 = 28,222.50/x
3. Step 3: Cross multiply
   18,816x = 28,222.50 × 28,222.50
4. Step 4: Simplify right side
   18,816x = 796,509,506.25
5. Step 5: Solve for x
   x = 796,509,506.25/18,816
6. Step 6: Final answer
   x = 42,331.50