Finding the Fourth Proportional to 22,313.76, 30,789.56 and 12,880.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,313.76 : 30,789.56 = 12,880.50 : x
2. Step 2: Convert to fraction form
   22,313.76/30,789.56 = 12,880.50/x
3. Step 3: Cross multiply
   22,313.76x = 30,789.56 × 12,880.50
4. Step 4: Simplify right side
   22,313.76x = 396,584,927.58
5. Step 5: Solve for x
   x = 396,584,927.58/22,313.76
6. Step 6: Final answer
   x = 17,773.11