Finding the Fourth Proportional to 12,709.71, 19,059.89 and 4,387.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,709.71 : 19,059.89 = 4,387.59 : x
2. Step 2: Convert to fraction form
   12,709.71/19,059.89 = 4,387.59/x
3. Step 3: Cross multiply
   12,709.71x = 19,059.89 × 4,387.59
4. Step 4: Simplify right side
   12,709.71x = 83,626,960.83
5. Step 5: Solve for x
   x = 83,626,960.83/12,709.71
6. Step 6: Final answer
   x = 6,579.77