Finding the Fourth Proportional to 10,789.10, 16,162.12 and 8,571.69

Step by Step Solution

1. Step 1: Write the proportion equation
   10,789.10 : 16,162.12 = 8,571.69 : x
2. Step 2: Convert to fraction form
   10,789.10/16,162.12 = 8,571.69/x
3. Step 3: Cross multiply
   10,789.10x = 16,162.12 × 8,571.69
4. Step 4: Simplify right side
   10,789.10x = 138,536,612.86
5. Step 5: Solve for x
   x = 138,536,612.86/10,789.10
6. Step 6: Final answer
   x = 12,840.42