Finding the Fourth Proportional to 12,738.72, 18,976.74 and 12,351.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,738.72 : 18,976.74 = 12,351.81 : x
2. Step 2: Convert to fraction form
   12,738.72/18,976.74 = 12,351.81/x
3. Step 3: Cross multiply
   12,738.72x = 18,976.74 × 12,351.81
4. Step 4: Simplify right side
   12,738.72x = 234,397,086.90
5. Step 5: Solve for x
   x = 234,397,086.90/12,738.72
6. Step 6: Final answer
   x = 18,400.36