Finding the Fourth Proportional to 12,389.86, 18,568.59 and 10,739.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,389.86 : 18,568.59 = 10,739.62 : x
2. Step 2: Convert to fraction form
   12,389.86/18,568.59 = 10,739.62/x
3. Step 3: Cross multiply
   12,389.86x = 18,568.59 × 10,739.62
4. Step 4: Simplify right side
   12,389.86x = 199,419,600.54
5. Step 5: Solve for x
   x = 199,419,600.54/12,389.86
6. Step 6: Final answer
   x = 16,095.39