Finding the Fourth Proportional to 3,960.74, 5,463.78 and 3,215.54

Step by Step Solution

1. Step 1: Write the proportion equation
   3,960.74 : 5,463.78 = 3,215.54 : x
2. Step 2: Convert to fraction form
   3,960.74/5,463.78 = 3,215.54/x
3. Step 3: Cross multiply
   3,960.74x = 5,463.78 × 3,215.54
4. Step 4: Simplify right side
   3,960.74x = 17,569,003.14
5. Step 5: Solve for x
   x = 17,569,003.14/3,960.74
6. Step 6: Final answer
   x = 4,435.79