Finding the Fourth Proportional to 2,828.09, 4,240.77 and 978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,828.09 : 4,240.77 = 978.56 : x
2. Step 2: Convert to fraction form
   2,828.09/4,240.77 = 978.56/x
3. Step 3: Cross multiply
   2,828.09x = 4,240.77 × 978.56
4. Step 4: Simplify right side
   2,828.09x = 4,149,858.49
5. Step 5: Solve for x
   x = 4,149,858.49/2,828.09
6. Step 6: Final answer
   x = 1,467.37