Finding the Third Proportional to 642,874.50 and 1,400,039

Step by Step Solution

1. Step 1: Write the proportion equation
   642,874.50 : 1,400,039 = 1,400,039 : x
2. Step 2: Convert to fraction form
   642,874.50/1,400,039 = 1,400,039/x
3. Step 3: Cross multiply
   642,874.50x = 1,400,039 × 1,400,039
4. Step 4: Simplify right side
   642,874.50x = 1,960,109,201,521
5. Step 5: Solve for x
   x = 1,960,109,201,521/642,874.50
6. Step 6: Final answer
   x = 3,048,976.44