Finding the Fourth Proportional to 2,439.32, 3,658.68 and 978.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.32 : 3,658.68 = 978.48 : x
2. Step 2: Convert to fraction form
   2,439.32/3,658.68 = 978.48/x
3. Step 3: Cross multiply
   2,439.32x = 3,658.68 × 978.48
4. Step 4: Simplify right side
   2,439.32x = 3,579,945.21
5. Step 5: Solve for x
   x = 3,579,945.21/2,439.32
6. Step 6: Final answer
   x = 1,467.60