Finding the Fourth Proportional to 12,711.82, 17,556.71 and 8,671.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,711.82 : 17,556.71 = 8,671.78 : x
2. Step 2: Convert to fraction form
   12,711.82/17,556.71 = 8,671.78/x
3. Step 3: Cross multiply
   12,711.82x = 17,556.71 × 8,671.78
4. Step 4: Simplify right side
   12,711.82x = 152,247,926.64
5. Step 5: Solve for x
   x = 152,247,926.64/12,711.82
6. Step 6: Final answer
   x = 11,976.88