Finding the Third Proportional to 142,429.50 and 307,431

Step by Step Solution

1. Step 1: Write the proportion equation
   142,429.50 : 307,431 = 307,431 : x
2. Step 2: Convert to fraction form
   142,429.50/307,431 = 307,431/x
3. Step 3: Cross multiply
   142,429.50x = 307,431 × 307,431
4. Step 4: Simplify right side
   142,429.50x = 94,513,819,761
5. Step 5: Solve for x
   x = 94,513,819,761/142,429.50
6. Step 6: Final answer
   x = 663,583.17