Finding the Fourth Proportional to 2,647.72, 3,964.71 and 2,569.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.72 : 3,964.71 = 2,569.79 : x
2. Step 2: Convert to fraction form
   2,647.72/3,964.71 = 2,569.79/x
3. Step 3: Cross multiply
   2,647.72x = 3,964.71 × 2,569.79
4. Step 4: Simplify right side
   2,647.72x = 10,188,491.66
5. Step 5: Solve for x
   x = 10,188,491.66/2,647.72
6. Step 6: Final answer
   x = 3,848.02