Finding the Fourth Proportional to 14,402.42, 19,864.61 and 12,789.28

Step by Step Solution

1. Step 1: Write the proportion equation
   14,402.42 : 19,864.61 = 12,789.28 : x
2. Step 2: Convert to fraction form
   14,402.42/19,864.61 = 12,789.28/x
3. Step 3: Cross multiply
   14,402.42x = 19,864.61 × 12,789.28
4. Step 4: Simplify right side
   14,402.42x = 254,054,059.38
5. Step 5: Solve for x
   x = 254,054,059.38/14,402.42
6. Step 6: Final answer
   x = 17,639.68