Finding the Third Proportional to 142,552 and 309,388

Step by Step Solution

1. Step 1: Write the proportion equation
   142,552 : 309,388 = 309,388 : x
2. Step 2: Convert to fraction form
   142,552/309,388 = 309,388/x
3. Step 3: Cross multiply
   142,552x = 309,388 × 309,388
4. Step 4: Simplify right side
   142,552x = 95,720,934,544
5. Step 5: Solve for x
   x = 95,720,934,544/142,552
6. Step 6: Final answer
   x = 671,480.82