Finding the Third Proportional to 687,834 and 917,356.50

Step by Step Solution

1. Step 1: Write the proportion equation
   687,834 : 917,356.50 = 917,356.50 : x
2. Step 2: Convert to fraction form
   687,834/917,356.50 = 917,356.50/x
3. Step 3: Cross multiply
   687,834x = 917,356.50 × 917,356.50
4. Step 4: Simplify right side
   687,834x = 841,542,948,092.25
5. Step 5: Solve for x
   x = 841,542,948,092.25/687,834
6. Step 6: Final answer
   x = 1,223,468.09