Finding the Fourth Proportional to 72.71, 109.11 and 72.48

Step by Step Solution

1. Step 1: Write the proportion equation
   72.71 : 109.11 = 72.48 : x
2. Step 2: Convert to fraction form
   72.71/109.11 = 72.48/x
3. Step 3: Cross multiply
   72.71x = 109.11 × 72.48
4. Step 4: Simplify right side
   72.71x = 7,908.57
5. Step 5: Solve for x
   x = 7,908.57/72.71
6. Step 6: Final answer
   x = 108.76