Finding the Fourth Proportional to 11,919.25, 16,451.59 and 8,143.94

Step by Step Solution

1. Step 1: Write the proportion equation
   11,919.25 : 16,451.59 = 8,143.94 : x
2. Step 2: Convert to fraction form
   11,919.25/16,451.59 = 8,143.94/x
3. Step 3: Cross multiply
   11,919.25x = 16,451.59 × 8,143.94
4. Step 4: Simplify right side
   11,919.25x = 133,980,761.86
5. Step 5: Solve for x
   x = 133,980,761.86/11,919.25
6. Step 6: Final answer
   x = 11,240.70