Finding the Third Proportional to 359,618.50 and 518,007.50

Step by Step Solution

1. Step 1: Write the proportion equation
   359,618.50 : 518,007.50 = 518,007.50 : x
2. Step 2: Convert to fraction form
   359,618.50/518,007.50 = 518,007.50/x
3. Step 3: Cross multiply
   359,618.50x = 518,007.50 × 518,007.50
4. Step 4: Simplify right side
   359,618.50x = 268,331,770,056.25
5. Step 5: Solve for x
   x = 268,331,770,056.25/359,618.50
6. Step 6: Final answer
   x = 746,156.75