Finding the Third Proportional to 684.50 and 938.50

Step by Step Solution

1. Step 1: Write the proportion equation
   684.50 : 938.50 = 938.50 : x
2. Step 2: Convert to fraction form
   684.50/938.50 = 938.50/x
3. Step 3: Cross multiply
   684.50x = 938.50 × 938.50
4. Step 4: Simplify right side
   684.50x = 880,782.25
5. Step 5: Solve for x
   x = 880,782.25/684.50
6. Step 6: Final answer
   x = 1,286.75