Finding the Fourth Proportional to 1,002.73, 1,383.50 and 688.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.73 : 1,383.50 = 688.09 : x
2. Step 2: Convert to fraction form
   1,002.73/1,383.50 = 688.09/x
3. Step 3: Cross multiply
   1,002.73x = 1,383.50 × 688.09
4. Step 4: Simplify right side
   1,002.73x = 951,972.52
5. Step 5: Solve for x
   x = 951,972.52/1,002.73
6. Step 6: Final answer
   x = 949.38