Finding the Fourth Proportional to 2,827.43, 4,240.20 and 978.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,827.43 : 4,240.20 = 978.05 : x
2. Step 2: Convert to fraction form
   2,827.43/4,240.20 = 978.05/x
3. Step 3: Cross multiply
   2,827.43x = 4,240.20 × 978.05
4. Step 4: Simplify right side
   2,827.43x = 4,147,112.53
5. Step 5: Solve for x
   x = 4,147,112.53/2,827.43
6. Step 6: Final answer
   x = 1,466.74