Finding the Fourth Proportional to 22,698.72, 34,080.24 and 12,857.28

Step by Step Solution

1. Step 1: Write the proportion equation
   22,698.72 : 34,080.24 = 12,857.28 : x
2. Step 2: Convert to fraction form
   22,698.72/34,080.24 = 12,857.28/x
3. Step 3: Cross multiply
   22,698.72x = 34,080.24 × 12,857.28
4. Step 4: Simplify right side
   22,698.72x = 438,179,188.15
5. Step 5: Solve for x
   x = 438,179,188.15/22,698.72
6. Step 6: Final answer
   x = 19,304.14