Finding the Fourth Proportional to 22,470.81, 31,009.19 and 12,399.25

Step by Step Solution

1. Step 1: Write the proportion equation
   22,470.81 : 31,009.19 = 12,399.25 : x
2. Step 2: Convert to fraction form
   22,470.81/31,009.19 = 12,399.25/x
3. Step 3: Cross multiply
   22,470.81x = 31,009.19 × 12,399.25
4. Step 4: Simplify right side
   22,470.81x = 384,490,739.82
5. Step 5: Solve for x
   x = 384,490,739.82/22,470.81
6. Step 6: Final answer
   x = 17,110.68