Finding the Third Proportional to 389,583 and 851,256

Step by Step Solution

1. Step 1: Write the proportion equation
   389,583 : 851,256 = 851,256 : x
2. Step 2: Convert to fraction form
   389,583/851,256 = 851,256/x
3. Step 3: Cross multiply
   389,583x = 851,256 × 851,256
4. Step 4: Simplify right side
   389,583x = 724,636,777,536
5. Step 5: Solve for x
   x = 724,636,777,536/389,583
6. Step 6: Final answer
   x = 1,860,031.82