Finding the Third Proportional to 688.50 and 939.52

Step by Step Solution

1. Step 1: Write the proportion equation
   688.50 : 939.52 = 939.52 : x
2. Step 2: Convert to fraction form
   688.50/939.52 = 939.52/x
3. Step 3: Cross multiply
   688.50x = 939.52 × 939.52
4. Step 4: Simplify right side
   688.50x = 882,689.61
5. Step 5: Solve for x
   x = 882,689.61/688.50
6. Step 6: Final answer
   x = 1,282.05