Finding the Fourth Proportional to 72.98, 101.18 and 71.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72.98 : 101.18 = 71.72 : x
2. Step 2: Convert to fraction form
   72.98/101.18 = 71.72/x
3. Step 3: Cross multiply
   72.98x = 101.18 × 71.72
4. Step 4: Simplify right side
   72.98x = 7,256.63
5. Step 5: Solve for x
   x = 7,256.63/72.98
6. Step 6: Final answer
   x = 99.43