Finding the Fourth Proportional to 72.24, 108.27 and 54.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72.24 : 108.27 = 54.15 : x
2. Step 2: Convert to fraction form
   72.24/108.27 = 54.15/x
3. Step 3: Cross multiply
   72.24x = 108.27 × 54.15
4. Step 4: Simplify right side
   72.24x = 5,862.82
5. Step 5: Solve for x
   x = 5,862.82/72.24
6. Step 6: Final answer
   x = 81.16