Finding the Third Proportional to 336,664 and 720,618.50

Step by Step Solution

1. Step 1: Write the proportion equation
   336,664 : 720,618.50 = 720,618.50 : x
2. Step 2: Convert to fraction form
   336,664/720,618.50 = 720,618.50/x
3. Step 3: Cross multiply
   336,664x = 720,618.50 × 720,618.50
4. Step 4: Simplify right side
   336,664x = 519,291,022,542.25
5. Step 5: Solve for x
   x = 519,291,022,542.25/336,664
6. Step 6: Final answer
   x = 1,542,460.80