Finding the Third Proportional to 90.84 and 131.34

Step by Step Solution

1. Step 1: Write the proportion equation
   90.84 : 131.34 = 131.34 : x
2. Step 2: Convert to fraction form
   90.84/131.34 = 131.34/x
3. Step 3: Cross multiply
   90.84x = 131.34 × 131.34
4. Step 4: Simplify right side
   90.84x = 17,251.18
5. Step 5: Solve for x
   x = 17,251.18/90.84
6. Step 6: Final answer
   x = 189.90