Finding the Fourth Proportional to 16,121.69, 22,241.57 and 9,311.21

Step by Step Solution

1. Step 1: Write the proportion equation
   16,121.69 : 22,241.57 = 9,311.21 : x
2. Step 2: Convert to fraction form
   16,121.69/22,241.57 = 9,311.21/x
3. Step 3: Cross multiply
   16,121.69x = 22,241.57 × 9,311.21
4. Step 4: Simplify right side
   16,121.69x = 207,095,794.51
5. Step 5: Solve for x
   x = 207,095,794.51/16,121.69
6. Step 6: Final answer
   x = 12,845.79