Finding the Fourth Proportional to 8,139.40, 11,228.15 and 5,150.09

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.40 : 11,228.15 = 5,150.09 : x
2. Step 2: Convert to fraction form
   8,139.40/11,228.15 = 5,150.09/x
3. Step 3: Cross multiply
   8,139.40x = 11,228.15 × 5,150.09
4. Step 4: Simplify right side
   8,139.40x = 57,826,023.98
5. Step 5: Solve for x
   x = 57,826,023.98/8,139.40
6. Step 6: Final answer
   x = 7,104.46