Finding the Fourth Proportional to 1,248.89, 1,723.39 and 689.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,248.89 : 1,723.39 = 689.36 : x
2. Step 2: Convert to fraction form
   1,248.89/1,723.39 = 689.36/x
3. Step 3: Cross multiply
   1,248.89x = 1,723.39 × 689.36
4. Step 4: Simplify right side
   1,248.89x = 1,188,038.72
5. Step 5: Solve for x
   x = 1,188,038.72/1,248.89
6. Step 6: Final answer
   x = 951.27