Finding the Fourth Proportional to 12,738.72, 18,976.72 and 12,351.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,738.72 : 18,976.72 = 12,351.80 : x
2. Step 2: Convert to fraction form
   12,738.72/18,976.72 = 12,351.80/x
3. Step 3: Cross multiply
   12,738.72x = 18,976.72 × 12,351.80
4. Step 4: Simplify right side
   12,738.72x = 234,396,650.10
5. Step 5: Solve for x
   x = 234,396,650.10/12,738.72
6. Step 6: Final answer
   x = 18,400.33