Finding the Fourth Proportional to 17,145.90, 25,720.74 and 5,456.39

Step by Step Solution

1. Step 1: Write the proportion equation
   17,145.90 : 25,720.74 = 5,456.39 : x
2. Step 2: Convert to fraction form
   17,145.90/25,720.74 = 5,456.39/x
3. Step 3: Cross multiply
   17,145.90x = 25,720.74 × 5,456.39
4. Step 4: Simplify right side
   17,145.90x = 140,342,259.92
5. Step 5: Solve for x
   x = 140,342,259.92/17,145.90
6. Step 6: Final answer
   x = 8,185.18