Finding the Third Proportional to 388,989 and 808,960.50

Step by Step Solution

1. Step 1: Write the proportion equation
   388,989 : 808,960.50 = 808,960.50 : x
2. Step 2: Convert to fraction form
   388,989/808,960.50 = 808,960.50/x
3. Step 3: Cross multiply
   388,989x = 808,960.50 × 808,960.50
4. Step 4: Simplify right side
   388,989x = 654,417,090,560.25
5. Step 5: Solve for x
   x = 654,417,090,560.25/388,989
6. Step 6: Final answer
   x = 1,682,353.72