Finding the Fourth Proportional to 5,165.28, 7,128.72 and 3,404.79

Step by Step Solution

1. Step 1: Write the proportion equation
   5,165.28 : 7,128.72 = 3,404.79 : x
2. Step 2: Convert to fraction form
   5,165.28/7,128.72 = 3,404.79/x
3. Step 3: Cross multiply
   5,165.28x = 7,128.72 × 3,404.79
4. Step 4: Simplify right side
   5,165.28x = 24,271,794.57
5. Step 5: Solve for x
   x = 24,271,794.57/5,165.28
6. Step 6: Final answer
   x = 4,699.03