Finding the Fourth Proportional to 72.88, 101.02 and 71.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72.88 : 101.02 = 71.72 : x
2. Step 2: Convert to fraction form
   72.88/101.02 = 71.72/x
3. Step 3: Cross multiply
   72.88x = 101.02 × 71.72
4. Step 4: Simplify right side
   72.88x = 7,245.15
5. Step 5: Solve for x
   x = 7,245.15/72.88
6. Step 6: Final answer
   x = 99.41