Finding the Fourth Proportional to 22,470.65, 31,009.47 and 12,399.08

Step by Step Solution

1. Step 1: Write the proportion equation
   22,470.65 : 31,009.47 = 12,399.08 : x
2. Step 2: Convert to fraction form
   22,470.65/31,009.47 = 12,399.08/x
3. Step 3: Cross multiply
   22,470.65x = 31,009.47 × 12,399.08
4. Step 4: Simplify right side
   22,470.65x = 384,488,930.31
5. Step 5: Solve for x
   x = 384,488,930.31/22,470.65
6. Step 6: Final answer
   x = 17,110.72