Finding the Fourth Proportional to 86.18, 118.91 and 48.83

Step by Step Solution

1. Step 1: Write the proportion equation
   86.18 : 118.91 = 48.83 : x
2. Step 2: Convert to fraction form
   86.18/118.91 = 48.83/x
3. Step 3: Cross multiply
   86.18x = 118.91 × 48.83
4. Step 4: Simplify right side
   86.18x = 5,805.54
5. Step 5: Solve for x
   x = 5,805.54/86.18
6. Step 6: Final answer
   x = 67.37