Finding the Third Proportional to 397,100 and 856,404

Step by Step Solution

1. Step 1: Write the proportion equation
   397,100 : 856,404 = 856,404 : x
2. Step 2: Convert to fraction form
   397,100/856,404 = 856,404/x
3. Step 3: Cross multiply
   397,100x = 856,404 × 856,404
4. Step 4: Simplify right side
   397,100x = 733,427,811,216
5. Step 5: Solve for x
   x = 733,427,811,216/397,100
6. Step 6: Final answer
   x = 1,846,959.99