Finding the Fourth Proportional to 22,429.80, 30,957.60 and 12,876.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,429.80 : 30,957.60 = 12,876.15 : x
2. Step 2: Convert to fraction form
   22,429.80/30,957.60 = 12,876.15/x
3. Step 3: Cross multiply
   22,429.80x = 30,957.60 × 12,876.15
4. Step 4: Simplify right side
   22,429.80x = 398,614,701.24
5. Step 5: Solve for x
   x = 398,614,701.24/22,429.80
6. Step 6: Final answer
   x = 17,771.66