Finding the Fourth Proportional to 2,827.68, 4,240.56 and 978.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,827.68 : 4,240.56 = 978.74 : x
2. Step 2: Convert to fraction form
   2,827.68/4,240.56 = 978.74/x
3. Step 3: Cross multiply
   2,827.68x = 4,240.56 × 978.74
4. Step 4: Simplify right side
   2,827.68x = 4,150,405.69
5. Step 5: Solve for x
   x = 4,150,405.69/2,827.68
6. Step 6: Final answer
   x = 1,467.78