Finding the Fourth Proportional to 20,864.06, 28,792.41 and 12,480.56

Step by Step Solution

1. Step 1: Write the proportion equation
   20,864.06 : 28,792.41 = 12,480.56 : x
2. Step 2: Convert to fraction form
   20,864.06/28,792.41 = 12,480.56/x
3. Step 3: Cross multiply
   20,864.06x = 28,792.41 × 12,480.56
4. Step 4: Simplify right side
   20,864.06x = 359,345,472.53
5. Step 5: Solve for x
   x = 359,345,472.53/20,864.06
6. Step 6: Final answer
   x = 17,223.18