Finding the Fourth Proportional to 131.82, 181.98 and 88.17

Step by Step Solution

1. Step 1: Write the proportion equation
   131.82 : 181.98 = 88.17 : x
2. Step 2: Convert to fraction form
   131.82/181.98 = 88.17/x
3. Step 3: Cross multiply
   131.82x = 181.98 × 88.17
4. Step 4: Simplify right side
   131.82x = 16,045.18
5. Step 5: Solve for x
   x = 16,045.18/131.82
6. Step 6: Final answer
   x = 121.72