Finding the Third Proportional to 140.25 and 212.38

Step by Step Solution

1. Step 1: Write the proportion equation
   140.25 : 212.38 = 212.38 : x
2. Step 2: Convert to fraction form
   140.25/212.38 = 212.38/x
3. Step 3: Cross multiply
   140.25x = 212.38 × 212.38
4. Step 4: Simplify right side
   140.25x = 45,103.14
5. Step 5: Solve for x
   x = 45,103.14/140.25
6. Step 6: Final answer
   x = 321.59