Finding the Third Proportional to 305,760 and 648,516

Step by Step Solution

1. Step 1: Write the proportion equation
   305,760 : 648,516 = 648,516 : x
2. Step 2: Convert to fraction form
   305,760/648,516 = 648,516/x
3. Step 3: Cross multiply
   305,760x = 648,516 × 648,516
4. Step 4: Simplify right side
   305,760x = 420,573,002,256
5. Step 5: Solve for x
   x = 420,573,002,256/305,760
6. Step 6: Final answer
   x = 1,375,500.40