Finding the Fourth Proportional to 109.09, 150.57 and 72.25

Step by Step Solution

1. Step 1: Write the proportion equation
   109.09 : 150.57 = 72.25 : x
2. Step 2: Convert to fraction form
   109.09/150.57 = 72.25/x
3. Step 3: Cross multiply
   109.09x = 150.57 × 72.25
4. Step 4: Simplify right side
   109.09x = 10,879.15
5. Step 5: Solve for x
   x = 10,879.15/109.09
6. Step 6: Final answer
   x = 99.73