Finding the Fourth Proportional to 21,863.24, 30,164.82 and 12,911.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,863.24 : 30,164.82 = 12,911.48 : x
2. Step 2: Convert to fraction form
   21,863.24/30,164.82 = 12,911.48/x
3. Step 3: Cross multiply
   21,863.24x = 30,164.82 × 12,911.48
4. Step 4: Simplify right side
   21,863.24x = 389,472,470.13
5. Step 5: Solve for x
   x = 389,472,470.13/21,863.24
6. Step 6: Final answer
   x = 17,814.03