Finding the Third Proportional to 142,286 and 309,628

Step by Step Solution

1. Step 1: Write the proportion equation
   142,286 : 309,628 = 309,628 : x
2. Step 2: Convert to fraction form
   142,286/309,628 = 309,628/x
3. Step 3: Cross multiply
   142,286x = 309,628 × 309,628
4. Step 4: Simplify right side
   142,286x = 95,869,498,384
5. Step 5: Solve for x
   x = 95,869,498,384/142,286
6. Step 6: Final answer
   x = 673,780.26