Finding the Third Proportional to 142,438.50 and 307,719

Step by Step Solution

1. Step 1: Write the proportion equation
   142,438.50 : 307,719 = 307,719 : x
2. Step 2: Convert to fraction form
   142,438.50/307,719 = 307,719/x
3. Step 3: Cross multiply
   142,438.50x = 307,719 × 307,719
4. Step 4: Simplify right side
   142,438.50x = 94,690,982,961
5. Step 5: Solve for x
   x = 94,690,982,961/142,438.50
6. Step 6: Final answer
   x = 664,785.03