Finding the Fourth Proportional to 28,798.78, 39,728.72 and 16,854.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,798.78 : 39,728.72 = 16,854.72 : x
2. Step 2: Convert to fraction form
   28,798.78/39,728.72 = 16,854.72/x
3. Step 3: Cross multiply
   28,798.78x = 39,728.72 × 16,854.72
4. Step 4: Simplify right side
   28,798.78x = 669,616,451.56
5. Step 5: Solve for x
   x = 669,616,451.56/28,798.78
6. Step 6: Final answer
   x = 23,251.56