Finding the Fourth Proportional to 20,480.96, 28,268.16 and 12,098.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,480.96 : 28,268.16 = 12,098.72 : x
2. Step 2: Convert to fraction form
   20,480.96/28,268.16 = 12,098.72/x
3. Step 3: Cross multiply
   20,480.96x = 28,268.16 × 12,098.72
4. Step 4: Simplify right side
   20,480.96x = 342,008,552.76
5. Step 5: Solve for x
   x = 342,008,552.76/20,480.96
6. Step 6: Final answer
   x = 16,698.85