Finding the Fourth Proportional to 16,826.30, 25,239.55 and 5,139.52

Step by Step Solution

1. Step 1: Write the proportion equation
   16,826.30 : 25,239.55 = 5,139.52 : x
2. Step 2: Convert to fraction form
   16,826.30/25,239.55 = 5,139.52/x
3. Step 3: Cross multiply
   16,826.30x = 25,239.55 × 5,139.52
4. Step 4: Simplify right side
   16,826.30x = 129,719,105.70
5. Step 5: Solve for x
   x = 129,719,105.70/16,826.30
6. Step 6: Final answer
   x = 7,709.31