Finding the Third Proportional to 287,401.50 and 435,078

Step by Step Solution

1. Step 1: Write the proportion equation
   287,401.50 : 435,078 = 435,078 : x
2. Step 2: Convert to fraction form
   287,401.50/435,078 = 435,078/x
3. Step 3: Cross multiply
   287,401.50x = 435,078 × 435,078
4. Step 4: Simplify right side
   287,401.50x = 189,292,866,084
5. Step 5: Solve for x
   x = 189,292,866,084/287,401.50
6. Step 6: Final answer
   x = 658,635.62