Finding the Fourth Proportional to 17,919.30, 26,879.00 and 5,439.42

Step by Step Solution

1. Step 1: Write the proportion equation
   17,919.30 : 26,879.00 = 5,439.42 : x
2. Step 2: Convert to fraction form
   17,919.30/26,879.00 = 5,439.42/x
3. Step 3: Cross multiply
   17,919.30x = 26,879.00 × 5,439.42
4. Step 4: Simplify right side
   17,919.30x = 146,206,142.98
5. Step 5: Solve for x
   x = 146,206,142.98/17,919.30
6. Step 6: Final answer
   x = 8,159.14