Finding the Fourth Proportional to 76.30, 105.32 and 54.49

Step by Step Solution

1. Step 1: Write the proportion equation
   76.30 : 105.32 = 54.49 : x
2. Step 2: Convert to fraction form
   76.30/105.32 = 54.49/x
3. Step 3: Cross multiply
   76.30x = 105.32 × 54.49
4. Step 4: Simplify right side
   76.30x = 5,738.89
5. Step 5: Solve for x
   x = 5,738.89/76.30
6. Step 6: Final answer
   x = 75.21