Finding the Third Proportional to 144,468 and 215,460

Step by Step Solution

1. Step 1: Write the proportion equation
   144,468 : 215,460 = 215,460 : x
2. Step 2: Convert to fraction form
   144,468/215,460 = 215,460/x
3. Step 3: Cross multiply
   144,468x = 215,460 × 215,460
4. Step 4: Simplify right side
   144,468x = 46,423,011,600
5. Step 5: Solve for x
   x = 46,423,011,600/144,468
6. Step 6: Final answer
   x = 321,337.68