Finding the Fourth Proportional to 12,589.17, 18,879.89 and 4,154.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,589.17 : 18,879.89 = 4,154.12 : x
2. Step 2: Convert to fraction form
   12,589.17/18,879.89 = 4,154.12/x
3. Step 3: Cross multiply
   12,589.17x = 18,879.89 × 4,154.12
4. Step 4: Simplify right side
   12,589.17x = 78,429,291.83
5. Step 5: Solve for x
   x = 78,429,291.83/12,589.17
6. Step 6: Final answer
   x = 6,229.90