Finding the Fourth Proportional to 11,665.54, 17,488.41 and 5,429.18

Step by Step Solution

1. Step 1: Write the proportion equation
   11,665.54 : 17,488.41 = 5,429.18 : x
2. Step 2: Convert to fraction form
   11,665.54/17,488.41 = 5,429.18/x
3. Step 3: Cross multiply
   11,665.54x = 17,488.41 × 5,429.18
4. Step 4: Simplify right side
   11,665.54x = 94,947,650.79
5. Step 5: Solve for x
   x = 94,947,650.79/11,665.54
6. Step 6: Final answer
   x = 8,139.15