Finding the Fourth Proportional to 72.18, 108.18 and 48.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72.18 : 108.18 = 48.15 : x
2. Step 2: Convert to fraction form
   72.18/108.18 = 48.15/x
3. Step 3: Cross multiply
   72.18x = 108.18 × 48.15
4. Step 4: Simplify right side
   72.18x = 5,208.87
5. Step 5: Solve for x
   x = 5,208.87/72.18
6. Step 6: Final answer
   x = 72.16