Finding the Fourth Proportional to 978.28, 1,461.86 and 956.41

Step by Step Solution

1. Step 1: Write the proportion equation
   978.28 : 1,461.86 = 956.41 : x
2. Step 2: Convert to fraction form
   978.28/1,461.86 = 956.41/x
3. Step 3: Cross multiply
   978.28x = 1,461.86 × 956.41
4. Step 4: Simplify right side
   978.28x = 1,398,137.52
5. Step 5: Solve for x
   x = 1,398,137.52/978.28
6. Step 6: Final answer
   x = 1,429.18