Finding the Third Proportional to 287,716 and 435,572.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,716 : 435,572.50 = 435,572.50 : x
2. Step 2: Convert to fraction form
   287,716/435,572.50 = 435,572.50/x
3. Step 3: Cross multiply
   287,716x = 435,572.50 × 435,572.50
4. Step 4: Simplify right side
   287,716x = 189,723,402,756.25
5. Step 5: Solve for x
   x = 189,723,402,756.25/287,716
6. Step 6: Final answer
   x = 659,412.07