Finding the Fourth Proportional to 12,818.46, 17,690.69 and 7,781.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,818.46 : 17,690.69 = 7,781.52 : x
2. Step 2: Convert to fraction form
   12,818.46/17,690.69 = 7,781.52/x
3. Step 3: Cross multiply
   12,818.46x = 17,690.69 × 7,781.52
4. Step 4: Simplify right side
   12,818.46x = 137,660,458.05
5. Step 5: Solve for x
   x = 137,660,458.05/12,818.46
6. Step 6: Final answer
   x = 10,739.24