Finding the Fourth Proportional to 5,105.69, 7,651.71 and 2,728.89

Step by Step Solution

1. Step 1: Write the proportion equation
   5,105.69 : 7,651.71 = 2,728.89 : x
2. Step 2: Convert to fraction form
   5,105.69/7,651.71 = 2,728.89/x
3. Step 3: Cross multiply
   5,105.69x = 7,651.71 × 2,728.89
4. Step 4: Simplify right side
   5,105.69x = 20,880,694.03
5. Step 5: Solve for x
   x = 20,880,694.03/5,105.69
6. Step 6: Final answer
   x = 4,089.69