Finding the Fourth Proportional to 71.93, 107.50 and 52.71

Step by Step Solution

1. Step 1: Write the proportion equation
   71.93 : 107.50 = 52.71 : x
2. Step 2: Convert to fraction form
   71.93/107.50 = 52.71/x
3. Step 3: Cross multiply
   71.93x = 107.50 × 52.71
4. Step 4: Simplify right side
   71.93x = 5,666.79
5. Step 5: Solve for x
   x = 5,666.79/71.93
6. Step 6: Final answer
   x = 78.78