Finding the Fourth Proportional to 22,260.78, 30,719.92 and 12,189.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,260.78 : 30,719.92 = 12,189.30 : x
2. Step 2: Convert to fraction form
   22,260.78/30,719.92 = 12,189.30/x
3. Step 3: Cross multiply
   22,260.78x = 30,719.92 × 12,189.30
4. Step 4: Simplify right side
   22,260.78x = 374,454,320.86
5. Step 5: Solve for x
   x = 374,454,320.86/22,260.78
6. Step 6: Final answer
   x = 16,821.26