Finding the Fourth Proportional to 1,248.37, 1,722.76 and 688.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,248.37 : 1,722.76 = 688.82 : x
2. Step 2: Convert to fraction form
   1,248.37/1,722.76 = 688.82/x
3. Step 3: Cross multiply
   1,248.37x = 1,722.76 × 688.82
4. Step 4: Simplify right side
   1,248.37x = 1,186,671.54
5. Step 5: Solve for x
   x = 1,186,671.54/1,248.37
6. Step 6: Final answer
   x = 950.58