Finding the Third Proportional to 378,957 and 810,421.50

Step by Step Solution

1. Step 1: Write the proportion equation
   378,957 : 810,421.50 = 810,421.50 : x
2. Step 2: Convert to fraction form
   378,957/810,421.50 = 810,421.50/x
3. Step 3: Cross multiply
   378,957x = 810,421.50 × 810,421.50
4. Step 4: Simplify right side
   378,957x = 656,783,007,662.25
5. Step 5: Solve for x
   x = 656,783,007,662.25/378,957
6. Step 6: Final answer
   x = 1,733,133.33