Finding the Third Proportional to 434,665 and 664,912.50

Step by Step Solution

1. Step 1: Write the proportion equation
   434,665 : 664,912.50 = 664,912.50 : x
2. Step 2: Convert to fraction form
   434,665/664,912.50 = 664,912.50/x
3. Step 3: Cross multiply
   434,665x = 664,912.50 × 664,912.50
4. Step 4: Simplify right side
   434,665x = 442,108,632,656.25
5. Step 5: Solve for x
   x = 442,108,632,656.25/434,665
6. Step 6: Final answer
   x = 1,017,124.99