Finding the Fourth Proportional to 3,964.15, 5,470.56 and 2,391.94

Step by Step Solution

1. Step 1: Write the proportion equation
   3,964.15 : 5,470.56 = 2,391.94 : x
2. Step 2: Convert to fraction form
   3,964.15/5,470.56 = 2,391.94/x
3. Step 3: Cross multiply
   3,964.15x = 5,470.56 × 2,391.94
4. Step 4: Simplify right side
   3,964.15x = 13,085,237.61
5. Step 5: Solve for x
   x = 13,085,237.61/3,964.15
6. Step 6: Final answer
   x = 3,300.90