Finding the Fourth Proportional to 86.91, 130.41 and 38.81

Step by Step Solution

1. Step 1: Write the proportion equation
   86.91 : 130.41 = 38.81 : x
2. Step 2: Convert to fraction form
   86.91/130.41 = 38.81/x
3. Step 3: Cross multiply
   86.91x = 130.41 × 38.81
4. Step 4: Simplify right side
   86.91x = 5,061.54
5. Step 5: Solve for x
   x = 5,061.54/86.91
6. Step 6: Final answer
   x = 58.24