Finding the Fourth Proportional to 1,016.91, 1,402.41 and 684.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.91 : 1,402.41 = 684.72 : x
2. Step 2: Convert to fraction form
   1,016.91/1,402.41 = 684.72/x
3. Step 3: Cross multiply
   1,016.91x = 1,402.41 × 684.72
4. Step 4: Simplify right side
   1,016.91x = 960,258.18
5. Step 5: Solve for x
   x = 960,258.18/1,016.91
6. Step 6: Final answer
   x = 944.29