Finding the Fourth Proportional to 2,439.24, 3,659.01 and 978.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.24 : 3,659.01 = 978.21 : x
2. Step 2: Convert to fraction form
   2,439.24/3,659.01 = 978.21/x
3. Step 3: Cross multiply
   2,439.24x = 3,659.01 × 978.21
4. Step 4: Simplify right side
   2,439.24x = 3,579,280.17
5. Step 5: Solve for x
   x = 3,579,280.17/2,439.24
6. Step 6: Final answer
   x = 1,467.38