Finding the Third Proportional to 688,640 and 923,610

Step by Step Solution

1. Step 1: Write the proportion equation
   688,640 : 923,610 = 923,610 : x
2. Step 2: Convert to fraction form
   688,640/923,610 = 923,610/x
3. Step 3: Cross multiply
   688,640x = 923,610 × 923,610
4. Step 4: Simplify right side
   688,640x = 853,055,432,100
5. Step 5: Solve for x
   x = 853,055,432,100/688,640
6. Step 6: Final answer
   x = 1,238,753.82