Finding the Fourth Proportional to 12,738.47, 18,976.37 and 12,351.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,738.47 : 18,976.37 = 12,351.56 : x
2. Step 2: Convert to fraction form
   12,738.47/18,976.37 = 12,351.56/x
3. Step 3: Cross multiply
   12,738.47x = 18,976.37 × 12,351.56
4. Step 4: Simplify right side
   12,738.47x = 234,387,710.88
5. Step 5: Solve for x
   x = 234,387,710.88/12,738.47
6. Step 6: Final answer
   x = 18,399.99