Finding the Fourth Proportional to 2,439.05, 3,659.00 and 978.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.05 : 3,659.00 = 978.21 : x
2. Step 2: Convert to fraction form
   2,439.05/3,659.00 = 978.21/x
3. Step 3: Cross multiply
   2,439.05x = 3,659.00 × 978.21
4. Step 4: Simplify right side
   2,439.05x = 3,579,265.50
5. Step 5: Solve for x
   x = 3,579,265.50/2,439.05
6. Step 6: Final answer
   x = 1,467.49