Finding the Fourth Proportional to 11,679.91, 16,118.72 and 6,644.59

Step by Step Solution

1. Step 1: Write the proportion equation
   11,679.91 : 16,118.72 = 6,644.59 : x
2. Step 2: Convert to fraction form
   11,679.91/16,118.72 = 6,644.59/x
3. Step 3: Cross multiply
   11,679.91x = 16,118.72 × 6,644.59
4. Step 4: Simplify right side
   11,679.91x = 107,102,285.72
5. Step 5: Solve for x
   x = 107,102,285.72/11,679.91
6. Step 6: Final answer
   x = 9,169.79