Finding the Fourth Proportional to 131.59, 181.52 and 90.17

Step by Step Solution

1. Step 1: Write the proportion equation
   131.59 : 181.52 = 90.17 : x
2. Step 2: Convert to fraction form
   131.59/181.52 = 90.17/x
3. Step 3: Cross multiply
   131.59x = 181.52 × 90.17
4. Step 4: Simplify right side
   131.59x = 16,367.32
5. Step 5: Solve for x
   x = 16,367.32/131.59
6. Step 6: Final answer
   x = 124.38