Finding the Fourth Proportional to 72.67, 108.87 and 49.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72.67 : 108.87 = 49.78 : x
2. Step 2: Convert to fraction form
   72.67/108.87 = 49.78/x
3. Step 3: Cross multiply
   72.67x = 108.87 × 49.78
4. Step 4: Simplify right side
   72.67x = 5,419.55
5. Step 5: Solve for x
   x = 5,419.55/72.67
6. Step 6: Final answer
   x = 74.58