Finding the Fourth Proportional to 21,258.27, 29,337.51 and 12,306.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,258.27 : 29,337.51 = 12,306.15 : x
2. Step 2: Convert to fraction form
   21,258.27/29,337.51 = 12,306.15/x
3. Step 3: Cross multiply
   21,258.27x = 29,337.51 × 12,306.15
4. Step 4: Simplify right side
   21,258.27x = 361,031,798.69
5. Step 5: Solve for x
   x = 361,031,798.69/21,258.27
6. Step 6: Final answer
   x = 16,983.12