Finding the Third Proportional to 287,355 and 624,496.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287,355 : 624,496.50 = 624,496.50 : x
2. Step 2: Convert to fraction form
   287,355/624,496.50 = 624,496.50/x
3. Step 3: Cross multiply
   287,355x = 624,496.50 × 624,496.50
4. Step 4: Simplify right side
   287,355x = 389,995,878,512.25
5. Step 5: Solve for x
   x = 389,995,878,512.25/287,355
6. Step 6: Final answer
   x = 1,357,191.90