Finding the Third Proportional to 433,990 and 657,105

Step by Step Solution

1. Step 1: Write the proportion equation
   433,990 : 657,105 = 657,105 : x
2. Step 2: Convert to fraction form
   433,990/657,105 = 657,105/x
3. Step 3: Cross multiply
   433,990x = 657,105 × 657,105
4. Step 4: Simplify right side
   433,990x = 431,786,981,025
5. Step 5: Solve for x
   x = 431,786,981,025/433,990
6. Step 6: Final answer
   x = 994,923.80