Finding the Fourth Proportional to 11,697.69, 16,142.22 and 6,391.47

Step by Step Solution

1. Step 1: Write the proportion equation
   11,697.69 : 16,142.22 = 6,391.47 : x
2. Step 2: Convert to fraction form
   11,697.69/16,142.22 = 6,391.47/x
3. Step 3: Cross multiply
   11,697.69x = 16,142.22 × 6,391.47
4. Step 4: Simplify right side
   11,697.69x = 103,172,514.86
5. Step 5: Solve for x
   x = 103,172,514.86/11,697.69
6. Step 6: Final answer
   x = 8,819.91