Finding the Third Proportional to 359,619.50 and 518,009

Step by Step Solution

1. Step 1: Write the proportion equation
   359,619.50 : 518,009 = 518,009 : x
2. Step 2: Convert to fraction form
   359,619.50/518,009 = 518,009/x
3. Step 3: Cross multiply
   359,619.50x = 518,009 × 518,009
4. Step 4: Simplify right side
   359,619.50x = 268,333,324,081
5. Step 5: Solve for x
   x = 268,333,324,081/359,619.50
6. Step 6: Final answer
   x = 746,158.99