Finding the Fourth Proportional to 22,758.18, 31,407.36 and 12,686.69

Step by Step Solution

1. Step 1: Write the proportion equation
   22,758.18 : 31,407.36 = 12,686.69 : x
2. Step 2: Convert to fraction form
   22,758.18/31,407.36 = 12,686.69/x
3. Step 3: Cross multiply
   22,758.18x = 31,407.36 × 12,686.69
4. Step 4: Simplify right side
   22,758.18x = 398,455,440.04
5. Step 5: Solve for x
   x = 398,455,440.04/22,758.18
6. Step 6: Final answer
   x = 17,508.23