Finding the Fourth Proportional to 22,387.15, 30,890.82 and 12,953.89

Step by Step Solution

1. Step 1: Write the proportion equation
   22,387.15 : 30,890.82 = 12,953.89 : x
2. Step 2: Convert to fraction form
   22,387.15/30,890.82 = 12,953.89/x
3. Step 3: Cross multiply
   22,387.15x = 30,890.82 × 12,953.89
4. Step 4: Simplify right side
   22,387.15x = 400,156,284.29
5. Step 5: Solve for x
   x = 400,156,284.29/22,387.15
6. Step 6: Final answer
   x = 17,874.37