Finding the Fourth Proportional to 86.84, 130.12 and 38.72

Step by Step Solution

1. Step 1: Write the proportion equation
   86.84 : 130.12 = 38.72 : x
2. Step 2: Convert to fraction form
   86.84/130.12 = 38.72/x
3. Step 3: Cross multiply
   86.84x = 130.12 × 38.72
4. Step 4: Simplify right side
   86.84x = 5,038.25
5. Step 5: Solve for x
   x = 5,038.25/86.84
6. Step 6: Final answer
   x = 58.02