Finding the Fourth Proportional to 17,130.72, 25,687.98 and 5,440.80

Step by Step Solution

1. Step 1: Write the proportion equation
   17,130.72 : 25,687.98 = 5,440.80 : x
2. Step 2: Convert to fraction form
   17,130.72/25,687.98 = 5,440.80/x
3. Step 3: Cross multiply
   17,130.72x = 25,687.98 × 5,440.80
4. Step 4: Simplify right side
   17,130.72x = 139,763,161.58
5. Step 5: Solve for x
   x = 139,763,161.58/17,130.72
6. Step 6: Final answer
   x = 8,158.63