Finding the Third Proportional to 665,388 and 1,042,438.50

Step by Step Solution

1. Step 1: Write the proportion equation
   665,388 : 1,042,438.50 = 1,042,438.50 : x
2. Step 2: Convert to fraction form
   665,388/1,042,438.50 = 1,042,438.50/x
3. Step 3: Cross multiply
   665,388x = 1,042,438.50 × 1,042,438.50
4. Step 4: Simplify right side
   665,388x = 1,086,678,026,282.25
5. Step 5: Solve for x
   x = 1,086,678,026,282.25/665,388
6. Step 6: Final answer
   x = 1,633,149.42