Finding the Fourth Proportional to 978.16, 1,359.34 and 965.92

Step by Step Solution

1. Step 1: Write the proportion equation
   978.16 : 1,359.34 = 965.92 : x
2. Step 2: Convert to fraction form
   978.16/1,359.34 = 965.92/x
3. Step 3: Cross multiply
   978.16x = 1,359.34 × 965.92
4. Step 4: Simplify right side
   978.16x = 1,313,013.69
5. Step 5: Solve for x
   x = 1,313,013.69/978.16
6. Step 6: Final answer
   x = 1,342.33