Finding the Fourth Proportional to 22,470.31, 31,009.19 and 12,399.12

Step by Step Solution

1. Step 1: Write the proportion equation
   22,470.31 : 31,009.19 = 12,399.12 : x
2. Step 2: Convert to fraction form
   22,470.31/31,009.19 = 12,399.12/x
3. Step 3: Cross multiply
   22,470.31x = 31,009.19 × 12,399.12
4. Step 4: Simplify right side
   22,470.31x = 384,486,667.91
5. Step 5: Solve for x
   x = 384,486,667.91/22,470.31
6. Step 6: Final answer
   x = 17,110.88