Finding the Third Proportional to 639,824 and 1,400,176

Step by Step Solution

1. Step 1: Write the proportion equation
   639,824 : 1,400,176 = 1,400,176 : x
2. Step 2: Convert to fraction form
   639,824/1,400,176 = 1,400,176/x
3. Step 3: Cross multiply
   639,824x = 1,400,176 × 1,400,176
4. Step 4: Simplify right side
   639,824x = 1,960,492,830,976
5. Step 5: Solve for x
   x = 1,960,492,830,976/639,824
6. Step 6: Final answer
   x = 3,064,112.68