Finding the Fourth Proportional to 1,224.38, 1,689.72 and 700.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,224.38 : 1,689.72 = 700.40 : x
2. Step 2: Convert to fraction form
   1,224.38/1,689.72 = 700.40/x
3. Step 3: Cross multiply
   1,224.38x = 1,689.72 × 700.40
4. Step 4: Simplify right side
   1,224.38x = 1,183,479.89
5. Step 5: Solve for x
   x = 1,183,479.89/1,224.38
6. Step 6: Final answer
   x = 966.60