Finding the Fourth Proportional to 17,328.61, 25,987.12 and 5,639.09

Step by Step Solution

1. Step 1: Write the proportion equation
   17,328.61 : 25,987.12 = 5,639.09 : x
2. Step 2: Convert to fraction form
   17,328.61/25,987.12 = 5,639.09/x
3. Step 3: Cross multiply
   17,328.61x = 25,987.12 × 5,639.09
4. Step 4: Simplify right side
   17,328.61x = 146,543,708.52
5. Step 5: Solve for x
   x = 146,543,708.52/17,328.61
6. Step 6: Final answer
   x = 8,456.75