Finding the Third Proportional to 287,358 and 624,456

Step by Step Solution

1. Step 1: Write the proportion equation
   287,358 : 624,456 = 624,456 : x
2. Step 2: Convert to fraction form
   287,358/624,456 = 624,456/x
3. Step 3: Cross multiply
   287,358x = 624,456 × 624,456
4. Step 4: Simplify right side
   287,358x = 389,945,295,936
5. Step 5: Solve for x
   x = 389,945,295,936/287,358
6. Step 6: Final answer
   x = 1,357,001.70