Finding the Fourth Proportional to 12,439.25, 17,148.02 and 9,449.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,439.25 : 17,148.02 = 9,449.89 : x
2. Step 2: Convert to fraction form
   12,439.25/17,148.02 = 9,449.89/x
3. Step 3: Cross multiply
   12,439.25x = 17,148.02 × 9,449.89
4. Step 4: Simplify right side
   12,439.25x = 162,046,926.34
5. Step 5: Solve for x
   x = 162,046,926.34/12,439.25
6. Step 6: Final answer
   x = 13,027.07