Finding the Fourth Proportional to 2,439.84, 3,660.16 and 978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.84 : 3,660.16 = 978.18 : x
2. Step 2: Convert to fraction form
   2,439.84/3,660.16 = 978.18/x
3. Step 3: Cross multiply
   2,439.84x = 3,660.16 × 978.18
4. Step 4: Simplify right side
   2,439.84x = 3,580,295.31
5. Step 5: Solve for x
   x = 3,580,295.31/2,439.84
6. Step 6: Final answer
   x = 1,467.43