Finding the Fourth Proportional to 22,448.38, 30,978.60 and 12,239.38

Step by Step Solution

1. Step 1: Write the proportion equation
   22,448.38 : 30,978.60 = 12,239.38 : x
2. Step 2: Convert to fraction form
   22,448.38/30,978.60 = 12,239.38/x
3. Step 3: Cross multiply
   22,448.38x = 30,978.60 × 12,239.38
4. Step 4: Simplify right side
   22,448.38x = 379,158,695.20
5. Step 5: Solve for x
   x = 379,158,695.20/22,448.38
6. Step 6: Final answer
   x = 16,890.25