Finding the Fourth Proportional to 72.57, 108.63 and 49.69

Step by Step Solution

1. Step 1: Write the proportion equation
   72.57 : 108.63 = 49.69 : x
2. Step 2: Convert to fraction form
   72.57/108.63 = 49.69/x
3. Step 3: Cross multiply
   72.57x = 108.63 × 49.69
4. Step 4: Simplify right side
   72.57x = 5,397.82
5. Step 5: Solve for x
   x = 5,397.82/72.57
6. Step 6: Final answer
   x = 74.38