Finding the Fourth Proportional to 4,759.56, 7,128.54 and 4,399.92

Step by Step Solution

1. Step 1: Write the proportion equation
   4,759.56 : 7,128.54 = 4,399.92 : x
2. Step 2: Convert to fraction form
   4,759.56/7,128.54 = 4,399.92/x
3. Step 3: Cross multiply
   4,759.56x = 7,128.54 × 4,399.92
4. Step 4: Simplify right side
   4,759.56x = 31,365,005.72
5. Step 5: Solve for x
   x = 31,365,005.72/4,759.56
6. Step 6: Final answer
   x = 6,589.90