Finding the Fourth Proportional to 109.50, 151.18 and 72.70

Step by Step Solution

1. Step 1: Write the proportion equation
   109.50 : 151.18 = 72.70 : x
2. Step 2: Convert to fraction form
   109.50/151.18 = 72.70/x
3. Step 3: Cross multiply
   109.50x = 151.18 × 72.70
4. Step 4: Simplify right side
   109.50x = 10,990.64
5. Step 5: Solve for x
   x = 10,990.64/109.50
6. Step 6: Final answer
   x = 100.37