Finding the Fourth Proportional to 109.16, 150.72 and 72.38

Step by Step Solution

1. Step 1: Write the proportion equation
   109.16 : 150.72 = 72.38 : x
2. Step 2: Convert to fraction form
   109.16/150.72 = 72.38/x
3. Step 3: Cross multiply
   109.16x = 150.72 × 72.38
4. Step 4: Simplify right side
   109.16x = 10,908.36
5. Step 5: Solve for x
   x = 10,908.36/109.16
6. Step 6: Final answer
   x = 99.93