Finding the Fourth Proportional to 131.41, 196.71 and 90.73

Step by Step Solution

1. Step 1: Write the proportion equation
   131.41 : 196.71 = 90.73 : x
2. Step 2: Convert to fraction form
   131.41/196.71 = 90.73/x
3. Step 3: Cross multiply
   131.41x = 196.71 × 90.73
4. Step 4: Simplify right side
   131.41x = 17,847.50
5. Step 5: Solve for x
   x = 17,847.50/131.41
6. Step 6: Final answer
   x = 135.82