Finding the Fourth Proportional to 86.69, 129.94 and 38.59

Step by Step Solution

1. Step 1: Write the proportion equation
   86.69 : 129.94 = 38.59 : x
2. Step 2: Convert to fraction form
   86.69/129.94 = 38.59/x
3. Step 3: Cross multiply
   86.69x = 129.94 × 38.59
4. Step 4: Simplify right side
   86.69x = 5,014.38
5. Step 5: Solve for x
   x = 5,014.38/86.69
6. Step 6: Final answer
   x = 57.84