Finding the Fourth Proportional to 78.84, 108.72 and 54.27

Step by Step Solution

1. Step 1: Write the proportion equation
   78.84 : 108.72 = 54.27 : x
2. Step 2: Convert to fraction form
   78.84/108.72 = 54.27/x
3. Step 3: Cross multiply
   78.84x = 108.72 × 54.27
4. Step 4: Simplify right side
   78.84x = 5,900.23
5. Step 5: Solve for x
   x = 5,900.23/78.84
6. Step 6: Final answer
   x = 74.84