Finding the Third Proportional to 389,974.50 and 810,567

Step by Step Solution

1. Step 1: Write the proportion equation
   389,974.50 : 810,567 = 810,567 : x
2. Step 2: Convert to fraction form
   389,974.50/810,567 = 810,567/x
3. Step 3: Cross multiply
   389,974.50x = 810,567 × 810,567
4. Step 4: Simplify right side
   389,974.50x = 657,018,861,489
5. Step 5: Solve for x
   x = 657,018,861,489/389,974.50
6. Step 6: Final answer
   x = 1,684,773.91