Finding the Fourth Proportional to 22,680, 31,300.32 and 12,745.92

Step by Step Solution

1. Step 1: Write the proportion equation
   22,680 : 31,300.32 = 12,745.92 : x
2. Step 2: Convert to fraction form
   22,680/31,300.32 = 12,745.92/x
3. Step 3: Cross multiply
   22,680x = 31,300.32 × 12,745.92
4. Step 4: Simplify right side
   22,680x = 398,951,374.69
5. Step 5: Solve for x
   x = 398,951,374.69/22,680
6. Step 6: Final answer
   x = 17,590.45