Finding the Third Proportional to 322,890 and 443,240

Step by Step Solution

1. Step 1: Write the proportion equation
   322,890 : 443,240 = 443,240 : x
2. Step 2: Convert to fraction form
   322,890/443,240 = 443,240/x
3. Step 3: Cross multiply
   322,890x = 443,240 × 443,240
4. Step 4: Simplify right side
   322,890x = 196,461,697,600
5. Step 5: Solve for x
   x = 196,461,697,600/322,890
6. Step 6: Final answer
   x = 608,447.76