Finding the Third Proportional to 518,487 and 799,840.50

Step by Step Solution

1. Step 1: Write the proportion equation
   518,487 : 799,840.50 = 799,840.50 : x
2. Step 2: Convert to fraction form
   518,487/799,840.50 = 799,840.50/x
3. Step 3: Cross multiply
   518,487x = 799,840.50 × 799,840.50
4. Step 4: Simplify right side
   518,487x = 639,744,825,440.25
5. Step 5: Solve for x
   x = 639,744,825,440.25/518,487
6. Step 6: Final answer
   x = 1,233,868.59