Finding the Fourth Proportional to 22,470.63, 31,009.71 and 12,399.42

Step by Step Solution

1. Step 1: Write the proportion equation
   22,470.63 : 31,009.71 = 12,399.42 : x
2. Step 2: Convert to fraction form
   22,470.63/31,009.71 = 12,399.42/x
3. Step 3: Cross multiply
   22,470.63x = 31,009.71 × 12,399.42
4. Step 4: Simplify right side
   22,470.63x = 384,502,418.37
5. Step 5: Solve for x
   x = 384,502,418.37/22,470.63
6. Step 6: Final answer
   x = 17,111.33