Finding the Fourth Proportional to 329.82, 494.69 and 86.37

Step by Step Solution

1. Step 1: Write the proportion equation
   329.82 : 494.69 = 86.37 : x
2. Step 2: Convert to fraction form
   329.82/494.69 = 86.37/x
3. Step 3: Cross multiply
   329.82x = 494.69 × 86.37
4. Step 4: Simplify right side
   329.82x = 42,723.69
5. Step 5: Solve for x
   x = 42,723.69/329.82
6. Step 6: Final answer
   x = 129.54