Finding the Fourth Proportional to 12,724.05, 19,086.90 and 3,964.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,724.05 : 19,086.90 = 3,964.71 : x
2. Step 2: Convert to fraction form
   12,724.05/19,086.90 = 3,964.71/x
3. Step 3: Cross multiply
   12,724.05x = 19,086.90 × 3,964.71
4. Step 4: Simplify right side
   12,724.05x = 75,674,023.30
5. Step 5: Solve for x
   x = 75,674,023.30/12,724.05
6. Step 6: Final answer
   x = 5,947.32