Finding the Fourth Proportional to 19,142.78, 28,720.01 and 9,789.37

Step by Step Solution

1. Step 1: Write the proportion equation
   19,142.78 : 28,720.01 = 9,789.37 : x
2. Step 2: Convert to fraction form
   19,142.78/28,720.01 = 9,789.37/x
3. Step 3: Cross multiply
   19,142.78x = 28,720.01 × 9,789.37
4. Step 4: Simplify right side
   19,142.78x = 281,150,756.97
5. Step 5: Solve for x
   x = 281,150,756.97/19,142.78
6. Step 6: Final answer
   x = 14,687.04