Finding the Fourth Proportional to 72.56, 108.52 and 71.68

Step by Step Solution

1. Step 1: Write the proportion equation
   72.56 : 108.52 = 71.68 : x
2. Step 2: Convert to fraction form
   72.56/108.52 = 71.68/x
3. Step 3: Cross multiply
   72.56x = 108.52 × 71.68
4. Step 4: Simplify right side
   72.56x = 7,778.71
5. Step 5: Solve for x
   x = 7,778.71/72.56
6. Step 6: Final answer
   x = 107.20