Finding the Fourth Proportional to 12,898.57, 19,344.72 and 9,429.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,898.57 : 19,344.72 = 9,429.45 : x
2. Step 2: Convert to fraction form
   12,898.57/19,344.72 = 9,429.45/x
3. Step 3: Cross multiply
   12,898.57x = 19,344.72 × 9,429.45
4. Step 4: Simplify right side
   12,898.57x = 182,410,070.00
5. Step 5: Solve for x
   x = 182,410,070.00/12,898.57
6. Step 6: Final answer
   x = 14,141.88