Finding the Fourth Proportional to 17,165.40, 25,746.48 and 5,478.72

Step by Step Solution

1. Step 1: Write the proportion equation
   17,165.40 : 25,746.48 = 5,478.72 : x
2. Step 2: Convert to fraction form
   17,165.40/25,746.48 = 5,478.72/x
3. Step 3: Cross multiply
   17,165.40x = 25,746.48 × 5,478.72
4. Step 4: Simplify right side
   17,165.40x = 141,057,754.91
5. Step 5: Solve for x
   x = 141,057,754.91/17,165.40
6. Step 6: Final answer
   x = 8,217.56