Finding the Fourth Proportional to 73.98, 102.57 and 72.72

Step by Step Solution

1. Step 1: Write the proportion equation
   73.98 : 102.57 = 72.72 : x
2. Step 2: Convert to fraction form
   73.98/102.57 = 72.72/x
3. Step 3: Cross multiply
   73.98x = 102.57 × 72.72
4. Step 4: Simplify right side
   73.98x = 7,458.89
5. Step 5: Solve for x
   x = 7,458.89/73.98
6. Step 6: Final answer
   x = 100.82