Finding the Fourth Proportional to 2,439.56, 3,659.80 and 978.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.56 : 3,659.80 = 978.83 : x
2. Step 2: Convert to fraction form
   2,439.56/3,659.80 = 978.83/x
3. Step 3: Cross multiply
   2,439.56x = 3,659.80 × 978.83
4. Step 4: Simplify right side
   2,439.56x = 3,582,303.74
5. Step 5: Solve for x
   x = 3,582,303.74/2,439.56
6. Step 6: Final answer
   x = 1,468.42