Finding the Fourth Proportional to 12,781.71, 19,183.63 and 12,752.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,781.71 : 19,183.63 = 12,752.15 : x
2. Step 2: Convert to fraction form
   12,781.71/19,183.63 = 12,752.15/x
3. Step 3: Cross multiply
   12,781.71x = 19,183.63 × 12,752.15
4. Step 4: Simplify right side
   12,781.71x = 244,632,527.30
5. Step 5: Solve for x
   x = 244,632,527.30/12,781.71
6. Step 6: Final answer
   x = 19,139.27