Finding the Third Proportional to 639,894 and 1,400,316

Step by Step Solution

1. Step 1: Write the proportion equation
   639,894 : 1,400,316 = 1,400,316 : x
2. Step 2: Convert to fraction form
   639,894/1,400,316 = 1,400,316/x
3. Step 3: Cross multiply
   639,894x = 1,400,316 × 1,400,316
4. Step 4: Simplify right side
   639,894x = 1,960,884,899,856
5. Step 5: Solve for x
   x = 1,960,884,899,856/639,894
6. Step 6: Final answer
   x = 3,064,390.20