Finding the Third Proportional to 142.13 and 382.31

Step by Step Solution

1. Step 1: Write the proportion equation
   142.13 : 382.31 = 382.31 : x
2. Step 2: Convert to fraction form
   142.13/382.31 = 382.31/x
3. Step 3: Cross multiply
   142.13x = 382.31 × 382.31
4. Step 4: Simplify right side
   142.13x = 146,162.85
5. Step 5: Solve for x
   x = 146,162.85/142.13
6. Step 6: Final answer
   x = 1,028.41