Finding the Third Proportional to 639,819 and 1,400,166

Step by Step Solution

1. Step 1: Write the proportion equation
   639,819 : 1,400,166 = 1,400,166 : x
2. Step 2: Convert to fraction form
   639,819/1,400,166 = 1,400,166/x
3. Step 3: Cross multiply
   639,819x = 1,400,166 × 1,400,166
4. Step 4: Simplify right side
   639,819x = 1,960,464,827,556
5. Step 5: Solve for x
   x = 1,960,464,827,556/639,819
6. Step 6: Final answer
   x = 3,064,092.86