Finding the Fourth Proportional to 978.41, 1,465.71 and 869.33

Step by Step Solution

1. Step 1: Write the proportion equation
   978.41 : 1,465.71 = 869.33 : x
2. Step 2: Convert to fraction form
   978.41/1,465.71 = 869.33/x
3. Step 3: Cross multiply
   978.41x = 1,465.71 × 869.33
4. Step 4: Simplify right side
   978.41x = 1,274,178.35
5. Step 5: Solve for x
   x = 1,274,178.35/978.41
6. Step 6: Final answer
   x = 1,302.30