Finding the Fourth Proportional to 2,644.53, 3,967.15 and 978.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,644.53 : 3,967.15 = 978.43 : x
2. Step 2: Convert to fraction form
   2,644.53/3,967.15 = 978.43/x
3. Step 3: Cross multiply
   2,644.53x = 3,967.15 × 978.43
4. Step 4: Simplify right side
   2,644.53x = 3,881,582.92
5. Step 5: Solve for x
   x = 3,881,582.92/2,644.53
6. Step 6: Final answer
   x = 1,467.78