Finding the Fourth Proportional to 19,180.72, 28,773.76 and 8,649.28

Step by Step Solution

1. Step 1: Write the proportion equation
   19,180.72 : 28,773.76 = 8,649.28 : x
2. Step 2: Convert to fraction form
   19,180.72/28,773.76 = 8,649.28/x
3. Step 3: Cross multiply
   19,180.72x = 28,773.76 × 8,649.28
4. Step 4: Simplify right side
   19,180.72x = 248,872,306.89
5. Step 5: Solve for x
   x = 248,872,306.89/19,180.72
6. Step 6: Final answer
   x = 12,975.13