Finding the Fourth Proportional to 72.63, 108.81 and 54.54

Step by Step Solution

1. Step 1: Write the proportion equation
   72.63 : 108.81 = 54.54 : x
2. Step 2: Convert to fraction form
   72.63/108.81 = 54.54/x
3. Step 3: Cross multiply
   72.63x = 108.81 × 54.54
4. Step 4: Simplify right side
   72.63x = 5,934.50
5. Step 5: Solve for x
   x = 5,934.50/72.63
6. Step 6: Final answer
   x = 81.71