Finding the Fourth Proportional to 11,609.72, 16,029.75 and 7,139.48

Step by Step Solution

1. Step 1: Write the proportion equation
   11,609.72 : 16,029.75 = 7,139.48 : x
2. Step 2: Convert to fraction form
   11,609.72/16,029.75 = 7,139.48/x
3. Step 3: Cross multiply
   11,609.72x = 16,029.75 × 7,139.48
4. Step 4: Simplify right side
   11,609.72x = 114,444,079.53
5. Step 5: Solve for x
   x = 114,444,079.53/11,609.72
6. Step 6: Final answer
   x = 9,857.61