Finding the Fourth Proportional to 131.01, 196.37 and 90.30

Step by Step Solution

1. Step 1: Write the proportion equation
   131.01 : 196.37 = 90.30 : x
2. Step 2: Convert to fraction form
   131.01/196.37 = 90.30/x
3. Step 3: Cross multiply
   131.01x = 196.37 × 90.30
4. Step 4: Simplify right side
   131.01x = 17,732.21
5. Step 5: Solve for x
   x = 17,732.21/131.01
6. Step 6: Final answer
   x = 135.35