Finding the Fourth Proportional to 5,485.25, 7,571.00 and 3,128.76

Step by Step Solution

1. Step 1: Write the proportion equation
   5,485.25 : 7,571.00 = 3,128.76 : x
2. Step 2: Convert to fraction form
   5,485.25/7,571.00 = 3,128.76/x
3. Step 3: Cross multiply
   5,485.25x = 7,571.00 × 3,128.76
4. Step 4: Simplify right side
   5,485.25x = 23,687,849.78
5. Step 5: Solve for x
   x = 23,687,849.78/5,485.25
6. Step 6: Final answer
   x = 4,318.46