Finding the Fourth Proportional to 21,363.48, 29,480.69 and 12,288.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,363.48 : 29,480.69 = 12,288.15 : x
2. Step 2: Convert to fraction form
   21,363.48/29,480.69 = 12,288.15/x
3. Step 3: Cross multiply
   21,363.48x = 29,480.69 × 12,288.15
4. Step 4: Simplify right side
   21,363.48x = 362,263,140.82
5. Step 5: Solve for x
   x = 362,263,140.82/21,363.48
6. Step 6: Final answer
   x = 16,957.12