Finding the Fourth Proportional to 16,391.69, 22,621.43 and 12,405.77

Step by Step Solution

1. Step 1: Write the proportion equation
   16,391.69 : 22,621.43 = 12,405.77 : x
2. Step 2: Convert to fraction form
   16,391.69/22,621.43 = 12,405.77/x
3. Step 3: Cross multiply
   16,391.69x = 22,621.43 × 12,405.77
4. Step 4: Simplify right side
   16,391.69x = 280,636,195.62
5. Step 5: Solve for x
   x = 280,636,195.62/16,391.69
6. Step 6: Final answer
   x = 17,120.64