Finding the Third Proportional to 111.38 and 131.63

Step by Step Solution

1. Step 1: Write the proportion equation
   111.38 : 131.63 = 131.63 : x
2. Step 2: Convert to fraction form
   111.38/131.63 = 131.63/x
3. Step 3: Cross multiply
   111.38x = 131.63 × 131.63
4. Step 4: Simplify right side
   111.38x = 17,325.14
5. Step 5: Solve for x
   x = 17,325.14/111.38
6. Step 6: Final answer
   x = 155.56