Finding the Third Proportional to 216,724.50 and 287,568

Step by Step Solution

1. Step 1: Write the proportion equation
   216,724.50 : 287,568 = 287,568 : x
2. Step 2: Convert to fraction form
   216,724.50/287,568 = 287,568/x
3. Step 3: Cross multiply
   216,724.50x = 287,568 × 287,568
4. Step 4: Simplify right side
   216,724.50x = 82,695,354,624
5. Step 5: Solve for x
   x = 82,695,354,624/216,724.50
6. Step 6: Final answer
   x = 381,569.02