Finding the Fourth Proportional to 78.48, 108.18 and 53.94

Step by Step Solution

1. Step 1: Write the proportion equation
   78.48 : 108.18 = 53.94 : x
2. Step 2: Convert to fraction form
   78.48/108.18 = 53.94/x
3. Step 3: Cross multiply
   78.48x = 108.18 × 53.94
4. Step 4: Simplify right side
   78.48x = 5,835.23
5. Step 5: Solve for x
   x = 5,835.23/78.48
6. Step 6: Final answer
   x = 74.35