Finding the Fourth Proportional to 2,439.18, 3,659.99 and 978.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.18 : 3,659.99 = 978.75 : x
2. Step 2: Convert to fraction form
   2,439.18/3,659.99 = 978.75/x
3. Step 3: Cross multiply
   2,439.18x = 3,659.99 × 978.75
4. Step 4: Simplify right side
   2,439.18x = 3,582,210.32
5. Step 5: Solve for x
   x = 3,582,210.32/2,439.18
6. Step 6: Final answer
   x = 1,468.61