Finding the Fourth Proportional to 1,249.10, 1,723.83 and 689.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,249.10 : 1,723.83 = 689.56 : x
2. Step 2: Convert to fraction form
   1,249.10/1,723.83 = 689.56/x
3. Step 3: Cross multiply
   1,249.10x = 1,723.83 × 689.56
4. Step 4: Simplify right side
   1,249.10x = 1,188,690.89
5. Step 5: Solve for x
   x = 1,188,690.89/1,249.10
6. Step 6: Final answer
   x = 951.64