Finding the Third Proportional to 639,810 and 1,400,148

Step by Step Solution

1. Step 1: Write the proportion equation
   639,810 : 1,400,148 = 1,400,148 : x
2. Step 2: Convert to fraction form
   639,810/1,400,148 = 1,400,148/x
3. Step 3: Cross multiply
   639,810x = 1,400,148 × 1,400,148
4. Step 4: Simplify right side
   639,810x = 1,960,414,421,904
5. Step 5: Solve for x
   x = 1,960,414,421,904/639,810
6. Step 6: Final answer
   x = 3,064,057.18