Finding the Fourth Proportional to 109.56, 151.18 and 72.71

Step by Step Solution

1. Step 1: Write the proportion equation
   109.56 : 151.18 = 72.71 : x
2. Step 2: Convert to fraction form
   109.56/151.18 = 72.71/x
3. Step 3: Cross multiply
   109.56x = 151.18 × 72.71
4. Step 4: Simplify right side
   109.56x = 10,991.54
5. Step 5: Solve for x
   x = 10,991.54/109.56
6. Step 6: Final answer
   x = 100.32