Finding the Third Proportional to 642,891 and 1,400,070

Step by Step Solution

1. Step 1: Write the proportion equation
   642,891 : 1,400,070 = 1,400,070 : x
2. Step 2: Convert to fraction form
   642,891/1,400,070 = 1,400,070/x
3. Step 3: Cross multiply
   642,891x = 1,400,070 × 1,400,070
4. Step 4: Simplify right side
   642,891x = 1,960,196,004,900
5. Step 5: Solve for x
   x = 1,960,196,004,900/642,891
6. Step 6: Final answer
   x = 3,049,033.20