Finding the Third Proportional to 378,958.50 and 820,990.69

Step by Step Solution

1. Step 1: Write the proportion equation
   378,958.50 : 820,990.69 = 820,990.69 : x
2. Step 2: Convert to fraction form
   378,958.50/820,990.69 = 820,990.69/x
3. Step 3: Cross multiply
   378,958.50x = 820,990.69 × 820,990.69
4. Step 4: Simplify right side
   378,958.50x = 674,025,708,961.72
5. Step 5: Solve for x
   x = 674,025,708,961.72/378,958.50
6. Step 6: Final answer
   x = 1,778,626.71