Finding the Third Proportional to 518,279.50 and 799,559.50

Step by Step Solution

1. Step 1: Write the proportion equation
   518,279.50 : 799,559.50 = 799,559.50 : x
2. Step 2: Convert to fraction form
   518,279.50/799,559.50 = 799,559.50/x
3. Step 3: Cross multiply
   518,279.50x = 799,559.50 × 799,559.50
4. Step 4: Simplify right side
   518,279.50x = 639,295,394,040.25
5. Step 5: Solve for x
   x = 639,295,394,040.25/518,279.50
6. Step 6: Final answer
   x = 1,233,495.43