Finding the Fourth Proportional to 109.89, 151.54 and 72.48

Step by Step Solution

1. Step 1: Write the proportion equation
   109.89 : 151.54 = 72.48 : x
2. Step 2: Convert to fraction form
   109.89/151.54 = 72.48/x
3. Step 3: Cross multiply
   109.89x = 151.54 × 72.48
4. Step 4: Simplify right side
   109.89x = 10,983.62
5. Step 5: Solve for x
   x = 10,983.62/109.89
6. Step 6: Final answer
   x = 99.95