Finding the Fourth Proportional to 131.38, 196.67 and 90.34

Step by Step Solution

1. Step 1: Write the proportion equation
   131.38 : 196.67 = 90.34 : x
2. Step 2: Convert to fraction form
   131.38/196.67 = 90.34/x
3. Step 3: Cross multiply
   131.38x = 196.67 × 90.34
4. Step 4: Simplify right side
   131.38x = 17,767.17
5. Step 5: Solve for x
   x = 17,767.17/131.38
6. Step 6: Final answer
   x = 135.23