Finding the Fourth Proportional to 2,439.68, 3,656.96 and 978.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.68 : 3,656.96 = 978.24 : x
2. Step 2: Convert to fraction form
   2,439.68/3,656.96 = 978.24/x
3. Step 3: Cross multiply
   2,439.68x = 3,656.96 × 978.24
4. Step 4: Simplify right side
   2,439.68x = 3,577,384.55
5. Step 5: Solve for x
   x = 3,577,384.55/2,439.68
6. Step 6: Final answer
   x = 1,466.33