Finding the Fourth Proportional to 131.96, 182.12 and 90.50

Step by Step Solution

1. Step 1: Write the proportion equation
   131.96 : 182.12 = 90.50 : x
2. Step 2: Convert to fraction form
   131.96/182.12 = 90.50/x
3. Step 3: Cross multiply
   131.96x = 182.12 × 90.50
4. Step 4: Simplify right side
   131.96x = 16,480.50
5. Step 5: Solve for x
   x = 16,480.50/131.96
6. Step 6: Final answer
   x = 124.89