Finding the Third Proportional to 851,394 and 1,280,666

Step by Step Solution

1. Step 1: Write the proportion equation
   851,394 : 1,280,666 = 1,280,666 : x
2. Step 2: Convert to fraction form
   851,394/1,280,666 = 1,280,666/x
3. Step 3: Cross multiply
   851,394x = 1,280,666 × 1,280,666
4. Step 4: Simplify right side
   851,394x = 1,640,105,403,556
5. Step 5: Solve for x
   x = 1,640,105,403,556/851,394
6. Step 6: Final answer
   x = 1,926,376.51