Finding the Fourth Proportional to 78.91, 108.94 and 52.71

Step by Step Solution

1. Step 1: Write the proportion equation
   78.91 : 108.94 = 52.71 : x
2. Step 2: Convert to fraction form
   78.91/108.94 = 52.71/x
3. Step 3: Cross multiply
   78.91x = 108.94 × 52.71
4. Step 4: Simplify right side
   78.91x = 5,742.23
5. Step 5: Solve for x
   x = 5,742.23/78.91
6. Step 6: Final answer
   x = 72.77