Finding the Third Proportional to 389,670 and 809,953.50

Step by Step Solution

1. Step 1: Write the proportion equation
   389,670 : 809,953.50 = 809,953.50 : x
2. Step 2: Convert to fraction form
   389,670/809,953.50 = 809,953.50/x
3. Step 3: Cross multiply
   389,670x = 809,953.50 × 809,953.50
4. Step 4: Simplify right side
   389,670x = 656,024,672,162.25
5. Step 5: Solve for x
   x = 656,024,672,162.25/389,670
6. Step 6: Final answer
   x = 1,683,539.08