Finding the Fourth Proportional to 22,758.49, 31,407.78 and 12,687.01

Step by Step Solution

1. Step 1: Write the proportion equation
   22,758.49 : 31,407.78 = 12,687.01 : x
2. Step 2: Convert to fraction form
   22,758.49/31,407.78 = 12,687.01/x
3. Step 3: Cross multiply
   22,758.49x = 31,407.78 × 12,687.01
4. Step 4: Simplify right side
   22,758.49x = 398,470,818.94
5. Step 5: Solve for x
   x = 398,470,818.94/22,758.49
6. Step 6: Final answer
   x = 17,508.67