Finding the Third Proportional to 289,766 and 443,260

Step by Step Solution

1. Step 1: Write the proportion equation
   289,766 : 443,260 = 443,260 : x
2. Step 2: Convert to fraction form
   289,766/443,260 = 443,260/x
3. Step 3: Cross multiply
   289,766x = 443,260 × 443,260
4. Step 4: Simplify right side
   289,766x = 196,479,427,600
5. Step 5: Solve for x
   x = 196,479,427,600/289,766
6. Step 6: Final answer
   x = 678,062.39