Finding the Third Proportional to 287,608.50 and 624,915

Step by Step Solution

1. Step 1: Write the proportion equation
   287,608.50 : 624,915 = 624,915 : x
2. Step 2: Convert to fraction form
   287,608.50/624,915 = 624,915/x
3. Step 3: Cross multiply
   287,608.50x = 624,915 × 624,915
4. Step 4: Simplify right side
   287,608.50x = 390,518,757,225
5. Step 5: Solve for x
   x = 390,518,757,225/287,608.50
6. Step 6: Final answer
   x = 1,357,813.69