Finding the Fourth Proportional to 12,954.15, 17,879.90 and 8,488.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,954.15 : 17,879.90 = 8,488.71 : x
2. Step 2: Convert to fraction form
   12,954.15/17,879.90 = 8,488.71/x
3. Step 3: Cross multiply
   12,954.15x = 17,879.90 × 8,488.71
4. Step 4: Simplify right side
   12,954.15x = 151,777,243.49
5. Step 5: Solve for x
   x = 151,777,243.49/12,954.15
6. Step 6: Final answer
   x = 11,716.50