Finding the Fourth Proportional to 2,709.68, 4,064.94 and 978.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,709.68 : 4,064.94 = 978.71 : x
2. Step 2: Convert to fraction form
   2,709.68/4,064.94 = 978.71/x
3. Step 3: Cross multiply
   2,709.68x = 4,064.94 × 978.71
4. Step 4: Simplify right side
   2,709.68x = 3,978,397.43
5. Step 5: Solve for x
   x = 3,978,397.43/2,709.68
6. Step 6: Final answer
   x = 1,468.22