Finding the Fourth Proportional to 72.69, 108.98 and 48.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72.69 : 108.98 = 48.78 : x
2. Step 2: Convert to fraction form
   72.69/108.98 = 48.78/x
3. Step 3: Cross multiply
   72.69x = 108.98 × 48.78
4. Step 4: Simplify right side
   72.69x = 5,315.80
5. Step 5: Solve for x
   x = 5,315.80/72.69
6. Step 6: Final answer
   x = 73.13