Finding the Third Proportional to 287,801 and 435,715.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,801 : 435,715.50 = 435,715.50 : x
2. Step 2: Convert to fraction form
   287,801/435,715.50 = 435,715.50/x
3. Step 3: Cross multiply
   287,801x = 435,715.50 × 435,715.50
4. Step 4: Simplify right side
   287,801x = 189,847,996,940.25
5. Step 5: Solve for x
   x = 189,847,996,940.25/287,801
6. Step 6: Final answer
   x = 659,650.23