Finding the Third Proportional to 312,039 and 456,949.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,039 : 456,949.50 = 456,949.50 : x
2. Step 2: Convert to fraction form
   312,039/456,949.50 = 456,949.50/x
3. Step 3: Cross multiply
   312,039x = 456,949.50 × 456,949.50
4. Step 4: Simplify right side
   312,039x = 208,802,845,550.25
5. Step 5: Solve for x
   x = 208,802,845,550.25/312,039
6. Step 6: Final answer
   x = 669,156.25