Finding the Fourth Proportional to 21,024.79, 31,498.90 and 12,233.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,024.79 : 31,498.90 = 12,233.05 : x
2. Step 2: Convert to fraction form
   21,024.79/31,498.90 = 12,233.05/x
3. Step 3: Cross multiply
   21,024.79x = 31,498.90 × 12,233.05
4. Step 4: Simplify right side
   21,024.79x = 385,327,509.32
5. Step 5: Solve for x
   x = 385,327,509.32/21,024.79
6. Step 6: Final answer
   x = 18,327.30