Finding the Fourth Proportional to 12,870.20, 19,339.92 and 12,029.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.20 : 19,339.92 = 12,029.42 : x
2. Step 2: Convert to fraction form
   12,870.20/19,339.92 = 12,029.42/x
3. Step 3: Cross multiply
   12,870.20x = 19,339.92 × 12,029.42
4. Step 4: Simplify right side
   12,870.20x = 232,647,923.75
5. Step 5: Solve for x
   x = 232,647,923.75/12,870.20
6. Step 6: Final answer
   x = 18,076.49