Finding the Fourth Proportional to 109.29, 150.69 and 72.42

Step by Step Solution

1. Step 1: Write the proportion equation
   109.29 : 150.69 = 72.42 : x
2. Step 2: Convert to fraction form
   109.29/150.69 = 72.42/x
3. Step 3: Cross multiply
   109.29x = 150.69 × 72.42
4. Step 4: Simplify right side
   109.29x = 10,912.97
5. Step 5: Solve for x
   x = 10,912.97/109.29
6. Step 6: Final answer
   x = 99.85