Finding the Fourth Proportional to 109.03, 150.42 and 72.18

Step by Step Solution

1. Step 1: Write the proportion equation
   109.03 : 150.42 = 72.18 : x
2. Step 2: Convert to fraction form
   109.03/150.42 = 72.18/x
3. Step 3: Cross multiply
   109.03x = 150.42 × 72.18
4. Step 4: Simplify right side
   109.03x = 10,857.32
5. Step 5: Solve for x
   x = 10,857.32/109.03
6. Step 6: Final answer
   x = 99.58