Finding the Third Proportional to 335,039 and 518,111.50

Step by Step Solution

1. Step 1: Write the proportion equation
   335,039 : 518,111.50 = 518,111.50 : x
2. Step 2: Convert to fraction form
   335,039/518,111.50 = 518,111.50/x
3. Step 3: Cross multiply
   335,039x = 518,111.50 × 518,111.50
4. Step 4: Simplify right side
   335,039x = 268,439,526,432.25
5. Step 5: Solve for x
   x = 268,439,526,432.25/335,039
6. Step 6: Final answer
   x = 801,218.74