Finding the Fourth Proportional to 108.72, 150.03 and 71.82

Step by Step Solution

1. Step 1: Write the proportion equation
   108.72 : 150.03 = 71.82 : x
2. Step 2: Convert to fraction form
   108.72/150.03 = 71.82/x
3. Step 3: Cross multiply
   108.72x = 150.03 × 71.82
4. Step 4: Simplify right side
   108.72x = 10,775.15
5. Step 5: Solve for x
   x = 10,775.15/108.72
6. Step 6: Final answer
   x = 99.11