Finding the Fourth Proportional to 72.77, 109.16 and 54.52

Step by Step Solution

1. Step 1: Write the proportion equation
   72.77 : 109.16 = 54.52 : x
2. Step 2: Convert to fraction form
   72.77/109.16 = 54.52/x
3. Step 3: Cross multiply
   72.77x = 109.16 × 54.52
4. Step 4: Simplify right side
   72.77x = 5,951.27
5. Step 5: Solve for x
   x = 5,951.27/72.77
6. Step 6: Final answer
   x = 81.78