Finding the Fourth Proportional to 22,762.56, 31,409.22 and 12,689.79

Step by Step Solution

1. Step 1: Write the proportion equation
   22,762.56 : 31,409.22 = 12,689.79 : x
2. Step 2: Convert to fraction form
   22,762.56/31,409.22 = 12,689.79/x
3. Step 3: Cross multiply
   22,762.56x = 31,409.22 × 12,689.79
4. Step 4: Simplify right side
   22,762.56x = 398,576,405.86
5. Step 5: Solve for x
   x = 398,576,405.86/22,762.56
6. Step 6: Final answer
   x = 17,510.17