Finding the Third Proportional to 300,240 and 648,591

Step by Step Solution

1. Step 1: Write the proportion equation
   300,240 : 648,591 = 648,591 : x
2. Step 2: Convert to fraction form
   300,240/648,591 = 648,591/x
3. Step 3: Cross multiply
   300,240x = 648,591 × 648,591
4. Step 4: Simplify right side
   300,240x = 420,670,285,281
5. Step 5: Solve for x
   x = 420,670,285,281/300,240
6. Step 6: Final answer
   x = 1,401,113.39