Finding the Fourth Proportional to 71.98, 107.88 and 52.72

Step by Step Solution

1. Step 1: Write the proportion equation
   71.98 : 107.88 = 52.72 : x
2. Step 2: Convert to fraction form
   71.98/107.88 = 52.72/x
3. Step 3: Cross multiply
   71.98x = 107.88 × 52.72
4. Step 4: Simplify right side
   71.98x = 5,687.43
5. Step 5: Solve for x
   x = 5,687.43/71.98
6. Step 6: Final answer
   x = 79.01