Finding the Fourth Proportional to 2,440.32, 3,661.28 and 978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,440.32 : 3,661.28 = 978.72 : x
2. Step 2: Convert to fraction form
   2,440.32/3,661.28 = 978.72/x
3. Step 3: Cross multiply
   2,440.32x = 3,661.28 × 978.72
4. Step 4: Simplify right side
   2,440.32x = 3,583,367.96
5. Step 5: Solve for x
   x = 3,583,367.96/2,440.32
6. Step 6: Final answer
   x = 1,468.40