Finding the Fourth Proportional to 2,439, 3,658.96 and 978.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439 : 3,658.96 = 978.27 : x
2. Step 2: Convert to fraction form
   2,439/3,658.96 = 978.27/x
3. Step 3: Cross multiply
   2,439x = 3,658.96 × 978.27
4. Step 4: Simplify right side
   2,439x = 3,579,438.30
5. Step 5: Solve for x
   x = 3,579,438.30/2,439
6. Step 6: Final answer
   x = 1,467.58