Finding the Fourth Proportional to 131.08, 196.47 and 90.52

Step by Step Solution

1. Step 1: Write the proportion equation
   131.08 : 196.47 = 90.52 : x
2. Step 2: Convert to fraction form
   131.08/196.47 = 90.52/x
3. Step 3: Cross multiply
   131.08x = 196.47 × 90.52
4. Step 4: Simplify right side
   131.08x = 17,784.46
5. Step 5: Solve for x
   x = 17,784.46/131.08
6. Step 6: Final answer
   x = 135.68