Finding the Fourth Proportional to 22,758.62, 31,407.95 and 12,687.12

Step by Step Solution

1. Step 1: Write the proportion equation
   22,758.62 : 31,407.95 = 12,687.12 : x
2. Step 2: Convert to fraction form
   22,758.62/31,407.95 = 12,687.12/x
3. Step 3: Cross multiply
   22,758.62x = 31,407.95 × 12,687.12
4. Step 4: Simplify right side
   22,758.62x = 398,476,462.32
5. Step 5: Solve for x
   x = 398,476,462.32/22,758.62
6. Step 6: Final answer
   x = 17,508.82