Finding the Fourth Proportional to 22,889.10, 31,590 and 12,818.10

Step by Step Solution

1. Step 1: Write the proportion equation
   22,889.10 : 31,590 = 12,818.10 : x
2. Step 2: Convert to fraction form
   22,889.10/31,590 = 12,818.10/x
3. Step 3: Cross multiply
   22,889.10x = 31,590 × 12,818.10
4. Step 4: Simplify right side
   22,889.10x = 404,923,779
5. Step 5: Solve for x
   x = 404,923,779/22,889.10
6. Step 6: Final answer
   x = 17,690.68