Finding the Fourth Proportional to 12,871.71, 19,305.95 and 4,105.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,871.71 : 19,305.95 = 4,105.89 : x
2. Step 2: Convert to fraction form
   12,871.71/19,305.95 = 4,105.89/x
3. Step 3: Cross multiply
   12,871.71x = 19,305.95 × 4,105.89
4. Step 4: Simplify right side
   12,871.71x = 79,268,086.52
5. Step 5: Solve for x
   x = 79,268,086.52/12,871.71
6. Step 6: Final answer
   x = 6,158.32