Finding the Fourth Proportional to 12,852.54, 17,739.81 and 8,139.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,852.54 : 17,739.81 = 8,139.42 : x
2. Step 2: Convert to fraction form
   12,852.54/17,739.81 = 8,139.42/x
3. Step 3: Cross multiply
   12,852.54x = 17,739.81 × 8,139.42
4. Step 4: Simplify right side
   12,852.54x = 144,391,764.31
5. Step 5: Solve for x
   x = 144,391,764.31/12,852.54
6. Step 6: Final answer
   x = 11,234.49