Finding the Fourth Proportional to 22,890.36, 31,589.83 and 12,818.82

Step by Step Solution

1. Step 1: Write the proportion equation
   22,890.36 : 31,589.83 = 12,818.82 : x
2. Step 2: Convert to fraction form
   22,890.36/31,589.83 = 12,818.82/x
3. Step 3: Cross multiply
   22,890.36x = 31,589.83 × 12,818.82
4. Step 4: Simplify right side
   22,890.36x = 404,944,479.09
5. Step 5: Solve for x
   x = 404,944,479.09/22,890.36
6. Step 6: Final answer
   x = 17,690.61