Finding the Fourth Proportional to 22,890.74, 31,588.85 and 12,819.09

Step by Step Solution

1. Step 1: Write the proportion equation
   22,890.74 : 31,588.85 = 12,819.09 : x
2. Step 2: Convert to fraction form
   22,890.74/31,588.85 = 12,819.09/x
3. Step 3: Cross multiply
   22,890.74x = 31,588.85 × 12,819.09
4. Step 4: Simplify right side
   22,890.74x = 404,940,247.05
5. Step 5: Solve for x
   x = 404,940,247.05/22,890.74
6. Step 6: Final answer
   x = 17,690.14