Finding the Fourth Proportional to 12,739.26, 17,581.98 and 7,434.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,739.26 : 17,581.98 = 7,434.30 : x
2. Step 2: Convert to fraction form
   12,739.26/17,581.98 = 7,434.30/x
3. Step 3: Cross multiply
   12,739.26x = 17,581.98 × 7,434.30
4. Step 4: Simplify right side
   12,739.26x = 130,709,713.91
5. Step 5: Solve for x
   x = 130,709,713.91/12,739.26
6. Step 6: Final answer
   x = 10,260.39