Finding the Fourth Proportional to 78.96, 108.86 and 52.74

Step by Step Solution

1. Step 1: Write the proportion equation
   78.96 : 108.86 = 52.74 : x
2. Step 2: Convert to fraction form
   78.96/108.86 = 52.74/x
3. Step 3: Cross multiply
   78.96x = 108.86 × 52.74
4. Step 4: Simplify right side
   78.96x = 5,740.70
5. Step 5: Solve for x
   x = 5,740.70/78.96
6. Step 6: Final answer
   x = 72.70