Finding the Fourth Proportional to 131.32, 196.94 and 90.58

Step by Step Solution

1. Step 1: Write the proportion equation
   131.32 : 196.94 = 90.58 : x
2. Step 2: Convert to fraction form
   131.32/196.94 = 90.58/x
3. Step 3: Cross multiply
   131.32x = 196.94 × 90.58
4. Step 4: Simplify right side
   131.32x = 17,838.83
5. Step 5: Solve for x
   x = 17,838.83/131.32
6. Step 6: Final answer
   x = 135.84