Finding the Third Proportional to 664,209 and 996,997.50

Step by Step Solution

1. Step 1: Write the proportion equation
   664,209 : 996,997.50 = 996,997.50 : x
2. Step 2: Convert to fraction form
   664,209/996,997.50 = 996,997.50/x
3. Step 3: Cross multiply
   664,209x = 996,997.50 × 996,997.50
4. Step 4: Simplify right side
   664,209x = 994,004,015,006.25
5. Step 5: Solve for x
   x = 994,004,015,006.25/664,209
6. Step 6: Final answer
   x = 1,496,522.95