Finding the Third Proportional to 131.38 and 306.88

Step by Step Solution

1. Step 1: Write the proportion equation
   131.38 : 306.88 = 306.88 : x
2. Step 2: Convert to fraction form
   131.38/306.88 = 306.88/x
3. Step 3: Cross multiply
   131.38x = 306.88 × 306.88
4. Step 4: Simplify right side
   131.38x = 94,172.27
5. Step 5: Solve for x
   x = 94,172.27/131.38
6. Step 6: Final answer
   x = 716.82