Finding the Fourth Proportional to 17,123.26, 25,687.70 and 5,439.28

Step by Step Solution

1. Step 1: Write the proportion equation
   17,123.26 : 25,687.70 = 5,439.28 : x
2. Step 2: Convert to fraction form
   17,123.26/25,687.70 = 5,439.28/x
3. Step 3: Cross multiply
   17,123.26x = 25,687.70 × 5,439.28
4. Step 4: Simplify right side
   17,123.26x = 139,722,592.86
5. Step 5: Solve for x
   x = 139,722,592.86/17,123.26
6. Step 6: Final answer
   x = 8,159.81