Finding the Fourth Proportional to 11,900.43, 16,429.23 and 8,129.25

Step by Step Solution

1. Step 1: Write the proportion equation
   11,900.43 : 16,429.23 = 8,129.25 : x
2. Step 2: Convert to fraction form
   11,900.43/16,429.23 = 8,129.25/x
3. Step 3: Cross multiply
   11,900.43x = 16,429.23 × 8,129.25
4. Step 4: Simplify right side
   11,900.43x = 133,557,317.98
5. Step 5: Solve for x
   x = 133,557,317.98/11,900.43
6. Step 6: Final answer
   x = 11,222.90