Finding the Fourth Proportional to 1,019.46, 1,414.56 and 978.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.46 : 1,414.56 = 978.33 : x
2. Step 2: Convert to fraction form
   1,019.46/1,414.56 = 978.33/x
3. Step 3: Cross multiply
   1,019.46x = 1,414.56 × 978.33
4. Step 4: Simplify right side
   1,019.46x = 1,383,906.48
5. Step 5: Solve for x
   x = 1,383,906.48/1,019.46
6. Step 6: Final answer
   x = 1,357.49