Finding the Third Proportional to 90.56 and 129.94

Step by Step Solution

1. Step 1: Write the proportion equation
   90.56 : 129.94 = 129.94 : x
2. Step 2: Convert to fraction form
   90.56/129.94 = 129.94/x
3. Step 3: Cross multiply
   90.56x = 129.94 × 129.94
4. Step 4: Simplify right side
   90.56x = 16,883.75
5. Step 5: Solve for x
   x = 16,883.75/90.56
6. Step 6: Final answer
   x = 186.43