Finding the Fourth Proportional to 2,438.80, 3,659.92 and 978.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,438.80 : 3,659.92 = 978.28 : x
2. Step 2: Convert to fraction form
   2,438.80/3,659.92 = 978.28/x
3. Step 3: Cross multiply
   2,438.80x = 3,659.92 × 978.28
4. Step 4: Simplify right side
   2,438.80x = 3,580,426.54
5. Step 5: Solve for x
   x = 3,580,426.54/2,438.80
6. Step 6: Final answer
   x = 1,468.11