Finding the Third Proportional to 640,176 and 1,398,468

Step by Step Solution

1. Step 1: Write the proportion equation
   640,176 : 1,398,468 = 1,398,468 : x
2. Step 2: Convert to fraction form
   640,176/1,398,468 = 1,398,468/x
3. Step 3: Cross multiply
   640,176x = 1,398,468 × 1,398,468
4. Step 4: Simplify right side
   640,176x = 1,955,712,747,024
5. Step 5: Solve for x
   x = 1,955,712,747,024/640,176
6. Step 6: Final answer
   x = 3,054,961.05