Finding the Fourth Proportional to 131.50, 196.85 and 90.28

Step by Step Solution

1. Step 1: Write the proportion equation
   131.50 : 196.85 = 90.28 : x
2. Step 2: Convert to fraction form
   131.50/196.85 = 90.28/x
3. Step 3: Cross multiply
   131.50x = 196.85 × 90.28
4. Step 4: Simplify right side
   131.50x = 17,770.18
5. Step 5: Solve for x
   x = 17,770.18/131.50
6. Step 6: Final answer
   x = 135.14