Finding the Fourth Proportional to 13,238.40, 18,271.06 and 7,934.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,238.40 : 18,271.06 = 7,934.88 : x
2. Step 2: Convert to fraction form
   13,238.40/18,271.06 = 7,934.88/x
3. Step 3: Cross multiply
   13,238.40x = 18,271.06 × 7,934.88
4. Step 4: Simplify right side
   13,238.40x = 144,978,668.57
5. Step 5: Solve for x
   x = 144,978,668.57/13,238.40
6. Step 6: Final answer
   x = 10,951.37