Finding the Third Proportional to 320,574.50 and 684,054

Step by Step Solution

1. Step 1: Write the proportion equation
   320,574.50 : 684,054 = 684,054 : x
2. Step 2: Convert to fraction form
   320,574.50/684,054 = 684,054/x
3. Step 3: Cross multiply
   320,574.50x = 684,054 × 684,054
4. Step 4: Simplify right side
   320,574.50x = 467,929,874,916
5. Step 5: Solve for x
   x = 467,929,874,916/320,574.50
6. Step 6: Final answer
   x = 1,459,660.31