Finding the Fourth Proportional to 78.49, 108.39 and 52.69

Step by Step Solution

1. Step 1: Write the proportion equation
   78.49 : 108.39 = 52.69 : x
2. Step 2: Convert to fraction form
   78.49/108.39 = 52.69/x
3. Step 3: Cross multiply
   78.49x = 108.39 × 52.69
4. Step 4: Simplify right side
   78.49x = 5,710.81
5. Step 5: Solve for x
   x = 5,710.81/78.49
6. Step 6: Final answer
   x = 72.76