Finding the Fourth Proportional to 86.86, 130.15 and 38.71

Step by Step Solution

1. Step 1: Write the proportion equation
   86.86 : 130.15 = 38.71 : x
2. Step 2: Convert to fraction form
   86.86/130.15 = 38.71/x
3. Step 3: Cross multiply
   86.86x = 130.15 × 38.71
4. Step 4: Simplify right side
   86.86x = 5,038.11
5. Step 5: Solve for x
   x = 5,038.11/86.86
6. Step 6: Final answer
   x = 58.00