Finding the Third Proportional to 518,763 and 778,144.50

Step by Step Solution

1. Step 1: Write the proportion equation
   518,763 : 778,144.50 = 778,144.50 : x
2. Step 2: Convert to fraction form
   518,763/778,144.50 = 778,144.50/x
3. Step 3: Cross multiply
   518,763x = 778,144.50 × 778,144.50
4. Step 4: Simplify right side
   518,763x = 605,508,862,880.25
5. Step 5: Solve for x
   x = 605,508,862,880.25/518,763
6. Step 6: Final answer
   x = 1,167,216.75