Finding the Third Proportional to 639,816 and 1,400,160

Step by Step Solution

1. Step 1: Write the proportion equation
   639,816 : 1,400,160 = 1,400,160 : x
2. Step 2: Convert to fraction form
   639,816/1,400,160 = 1,400,160/x
3. Step 3: Cross multiply
   639,816x = 1,400,160 × 1,400,160
4. Step 4: Simplify right side
   639,816x = 1,960,448,025,600
5. Step 5: Solve for x
   x = 1,960,448,025,600/639,816
6. Step 6: Final answer
   x = 3,064,080.96