Finding the Fourth Proportional to 22,320.28, 30,801.72 and 12,888.64

Step by Step Solution

1. Step 1: Write the proportion equation
   22,320.28 : 30,801.72 = 12,888.64 : x
2. Step 2: Convert to fraction form
   22,320.28/30,801.72 = 12,888.64/x
3. Step 3: Cross multiply
   22,320.28x = 30,801.72 × 12,888.64
4. Step 4: Simplify right side
   22,320.28x = 396,992,280.46
5. Step 5: Solve for x
   x = 396,992,280.46/22,320.28
6. Step 6: Final answer
   x = 17,786.17