Finding the Fourth Proportional to 22,709.89, 31,339.43 and 12,638.16

Step by Step Solution

1. Step 1: Write the proportion equation
   22,709.89 : 31,339.43 = 12,638.16 : x
2. Step 2: Convert to fraction form
   22,709.89/31,339.43 = 12,638.16/x
3. Step 3: Cross multiply
   22,709.89x = 31,339.43 × 12,638.16
4. Step 4: Simplify right side
   22,709.89x = 396,072,667.46
5. Step 5: Solve for x
   x = 396,072,667.46/22,709.89
6. Step 6: Final answer
   x = 17,440.54