Finding the Fourth Proportional to 22,386.89, 30,890.47 and 12,953.63

Step by Step Solution

1. Step 1: Write the proportion equation
   22,386.89 : 30,890.47 = 12,953.63 : x
2. Step 2: Convert to fraction form
   22,386.89/30,890.47 = 12,953.63/x
3. Step 3: Cross multiply
   22,386.89x = 30,890.47 × 12,953.63
4. Step 4: Simplify right side
   22,386.89x = 400,143,718.91
5. Step 5: Solve for x
   x = 400,143,718.91/22,386.89
6. Step 6: Final answer
   x = 17,874.02