Finding the Fourth Proportional to 22,890.84, 31,585.71 and 12,819.71

Step by Step Solution

1. Step 1: Write the proportion equation
   22,890.84 : 31,585.71 = 12,819.71 : x
2. Step 2: Convert to fraction form
   22,890.84/31,585.71 = 12,819.71/x
3. Step 3: Cross multiply
   22,890.84x = 31,585.71 × 12,819.71
4. Step 4: Simplify right side
   22,890.84x = 404,919,484.42
5. Step 5: Solve for x
   x = 404,919,484.42/22,890.84
6. Step 6: Final answer
   x = 17,689.15