Finding the Fourth Proportional to 72.45, 108.72 and 49.59

Step by Step Solution

1. Step 1: Write the proportion equation
   72.45 : 108.72 = 49.59 : x
2. Step 2: Convert to fraction form
   72.45/108.72 = 49.59/x
3. Step 3: Cross multiply
   72.45x = 108.72 × 49.59
4. Step 4: Simplify right side
   72.45x = 5,391.42
5. Step 5: Solve for x
   x = 5,391.42/72.45
6. Step 6: Final answer
   x = 74.42