Finding the Fourth Proportional to 19,743, 27,257.76 and 12,681.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,743 : 27,257.76 = 12,681.72 : x
2. Step 2: Convert to fraction form
   19,743/27,257.76 = 12,681.72/x
3. Step 3: Cross multiply
   19,743x = 27,257.76 × 12,681.72
4. Step 4: Simplify right side
   19,743x = 345,675,280.15
5. Step 5: Solve for x
   x = 345,675,280.15/19,743
6. Step 6: Final answer
   x = 17,508.75