Finding the Fourth Proportional to 978.41, 1,350.82 and 684.38

Step by Step Solution

1. Step 1: Write the proportion equation
   978.41 : 1,350.82 = 684.38 : x
2. Step 2: Convert to fraction form
   978.41/1,350.82 = 684.38/x
3. Step 3: Cross multiply
   978.41x = 1,350.82 × 684.38
4. Step 4: Simplify right side
   978.41x = 924,465.73
5. Step 5: Solve for x
   x = 924,465.73/978.41
6. Step 6: Final answer
   x = 944.87