Finding the Fourth Proportional to 1,248.52, 1,722.98 and 688.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,248.52 : 1,722.98 = 688.96 : x
2. Step 2: Convert to fraction form
   1,248.52/1,722.98 = 688.96/x
3. Step 3: Cross multiply
   1,248.52x = 1,722.98 × 688.96
4. Step 4: Simplify right side
   1,248.52x = 1,187,064.30
5. Step 5: Solve for x
   x = 1,187,064.30/1,248.52
6. Step 6: Final answer
   x = 950.78