Finding the Fourth Proportional to 76.29, 105.28 and 54.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76.29 : 105.28 = 54.50 : x
2. Step 2: Convert to fraction form
   76.29/105.28 = 54.50/x
3. Step 3: Cross multiply
   76.29x = 105.28 × 54.50
4. Step 4: Simplify right side
   76.29x = 5,737.10
5. Step 5: Solve for x
   x = 5,737.10/76.29
6. Step 6: Final answer
   x = 75.20