Finding the Fourth Proportional to 12,174.43, 16,804.31 and 7,139.74

Step by Step Solution

1. Step 1: Write the proportion equation
   12,174.43 : 16,804.31 = 7,139.74 : x
2. Step 2: Convert to fraction form
   12,174.43/16,804.31 = 7,139.74/x
3. Step 3: Cross multiply
   12,174.43x = 16,804.31 × 7,139.74
4. Step 4: Simplify right side
   12,174.43x = 119,978,284.56
5. Step 5: Solve for x
   x = 119,978,284.56/12,174.43
6. Step 6: Final answer
   x = 9,854.94