Finding the Fourth Proportional to 22,890.09, 31,584.68 and 12,818.96

Step by Step Solution

1. Step 1: Write the proportion equation
   22,890.09 : 31,584.68 = 12,818.96 : x
2. Step 2: Convert to fraction form
   22,890.09/31,584.68 = 12,818.96/x
3. Step 3: Cross multiply
   22,890.09x = 31,584.68 × 12,818.96
4. Step 4: Simplify right side
   22,890.09x = 404,882,527.51
5. Step 5: Solve for x
   x = 404,882,527.51/22,890.09
6. Step 6: Final answer
   x = 17,688.11