Finding the Third Proportional to 144,528 and 215,544

Step by Step Solution

1. Step 1: Write the proportion equation
   144,528 : 215,544 = 215,544 : x
2. Step 2: Convert to fraction form
   144,528/215,544 = 215,544/x
3. Step 3: Cross multiply
   144,528x = 215,544 × 215,544
4. Step 4: Simplify right side
   144,528x = 46,459,215,936
5. Step 5: Solve for x
   x = 46,459,215,936/144,528
6. Step 6: Final answer
   x = 321,454.78