Finding the Third Proportional to 639,556 and 1,385,096

Step by Step Solution

1. Step 1: Write the proportion equation
   639,556 : 1,385,096 = 1,385,096 : x
2. Step 2: Convert to fraction form
   639,556/1,385,096 = 1,385,096/x
3. Step 3: Cross multiply
   639,556x = 1,385,096 × 1,385,096
4. Step 4: Simplify right side
   639,556x = 1,918,490,929,216
5. Step 5: Solve for x
   x = 1,918,490,929,216/639,556
6. Step 6: Final answer
   x = 2,999,723.13