Finding the Third Proportional to 421,665 and 858,949.50

Step by Step Solution

1. Step 1: Write the proportion equation
   421,665 : 858,949.50 = 858,949.50 : x
2. Step 2: Convert to fraction form
   421,665/858,949.50 = 858,949.50/x
3. Step 3: Cross multiply
   421,665x = 858,949.50 × 858,949.50
4. Step 4: Simplify right side
   421,665x = 737,794,243,550.25
5. Step 5: Solve for x
   x = 737,794,243,550.25/421,665
6. Step 6: Final answer
   x = 1,749,716.58