Finding the Third Proportional to 323,385 and 680,287.50

Step by Step Solution

1. Step 1: Write the proportion equation
   323,385 : 680,287.50 = 680,287.50 : x
2. Step 2: Convert to fraction form
   323,385/680,287.50 = 680,287.50/x
3. Step 3: Cross multiply
   323,385x = 680,287.50 × 680,287.50
4. Step 4: Simplify right side
   323,385x = 462,791,082,656.25
5. Step 5: Solve for x
   x = 462,791,082,656.25/323,385
6. Step 6: Final answer
   x = 1,431,083.95