Finding the Fourth Proportional to 22,397.32, 30,909.57 and 12,838.79

Step by Step Solution

1. Step 1: Write the proportion equation
   22,397.32 : 30,909.57 = 12,838.79 : x
2. Step 2: Convert to fraction form
   22,397.32/30,909.57 = 12,838.79/x
3. Step 3: Cross multiply
   22,397.32x = 30,909.57 × 12,838.79
4. Step 4: Simplify right side
   22,397.32x = 396,841,555.49
5. Step 5: Solve for x
   x = 396,841,555.49/22,397.32
6. Step 6: Final answer
   x = 17,718.26