Finding the Fourth Proportional to 22,760.02, 31,407.78 and 12,689.56

Step by Step Solution

1. Step 1: Write the proportion equation
   22,760.02 : 31,407.78 = 12,689.56 : x
2. Step 2: Convert to fraction form
   22,760.02/31,407.78 = 12,689.56/x
3. Step 3: Cross multiply
   22,760.02x = 31,407.78 × 12,689.56
4. Step 4: Simplify right side
   22,760.02x = 398,550,908.78
5. Step 5: Solve for x
   x = 398,550,908.78/22,760.02
6. Step 6: Final answer
   x = 17,511.01