Finding the Fourth Proportional to 12,578.52, 18,863.46 and 4,789.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,578.52 : 18,863.46 = 4,789.56 : x
2. Step 2: Convert to fraction form
   12,578.52/18,863.46 = 4,789.56/x
3. Step 3: Cross multiply
   12,578.52x = 18,863.46 × 4,789.56
4. Step 4: Simplify right side
   12,578.52x = 90,347,673.48
5. Step 5: Solve for x
   x = 90,347,673.48/12,578.52
6. Step 6: Final answer
   x = 7,182.70