Finding the Fourth Proportional to 12,818.52, 17,691.18 and 7,439.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,818.52 : 17,691.18 = 7,439.81 : x
2. Step 2: Convert to fraction form
   12,818.52/17,691.18 = 7,439.81/x
3. Step 3: Cross multiply
   12,818.52x = 17,691.18 × 7,439.81
4. Step 4: Simplify right side
   12,818.52x = 131,618,951.28
5. Step 5: Solve for x
   x = 131,618,951.28/12,818.52
6. Step 6: Final answer
   x = 10,267.87