Finding the Fourth Proportional to 109.05, 150.37 and 72.16

Step by Step Solution

1. Step 1: Write the proportion equation
   109.05 : 150.37 = 72.16 : x
2. Step 2: Convert to fraction form
   109.05/150.37 = 72.16/x
3. Step 3: Cross multiply
   109.05x = 150.37 × 72.16
4. Step 4: Simplify right side
   109.05x = 10,850.70
5. Step 5: Solve for x
   x = 10,850.70/109.05
6. Step 6: Final answer
   x = 99.50