Finding the Third Proportional to 142,568 and 309,420

Step by Step Solution

1. Step 1: Write the proportion equation
   142,568 : 309,420 = 309,420 : x
2. Step 2: Convert to fraction form
   142,568/309,420 = 309,420/x
3. Step 3: Cross multiply
   142,568x = 309,420 × 309,420
4. Step 4: Simplify right side
   142,568x = 95,740,736,400
5. Step 5: Solve for x
   x = 95,740,736,400/142,568
6. Step 6: Final answer
   x = 671,544.36