Finding the Fourth Proportional to 106.69, 159.72 and 72.49

Step by Step Solution

1. Step 1: Write the proportion equation
   106.69 : 159.72 = 72.49 : x
2. Step 2: Convert to fraction form
   106.69/159.72 = 72.49/x
3. Step 3: Cross multiply
   106.69x = 159.72 × 72.49
4. Step 4: Simplify right side
   106.69x = 11,578.10
5. Step 5: Solve for x
   x = 11,578.10/106.69
6. Step 6: Final answer
   x = 108.52