Finding the Fourth Proportional to 11,648.25, 16,081.11 and 8,917.61

Step by Step Solution

1. Step 1: Write the proportion equation
   11,648.25 : 16,081.11 = 8,917.61 : x
2. Step 2: Convert to fraction form
   11,648.25/16,081.11 = 8,917.61/x
3. Step 3: Cross multiply
   11,648.25x = 16,081.11 × 8,917.61
4. Step 4: Simplify right side
   11,648.25x = 143,404,986.94
5. Step 5: Solve for x
   x = 143,404,986.94/11,648.25
6. Step 6: Final answer
   x = 12,311.29