Finding the Fourth Proportional to 72.69, 109 and 49.87

Step by Step Solution

1. Step 1: Write the proportion equation
   72.69 : 109 = 49.87 : x
2. Step 2: Convert to fraction form
   72.69/109 = 49.87/x
3. Step 3: Cross multiply
   72.69x = 109 × 49.87
4. Step 4: Simplify right side
   72.69x = 5,435.83
5. Step 5: Solve for x
   x = 5,435.83/72.69
6. Step 6: Final answer
   x = 74.78