Finding the Third Proportional to 428,494 and 818,108

Step by Step Solution

1. Step 1: Write the proportion equation
   428,494 : 818,108 = 818,108 : x
2. Step 2: Convert to fraction form
   428,494/818,108 = 818,108/x
3. Step 3: Cross multiply
   428,494x = 818,108 × 818,108
4. Step 4: Simplify right side
   428,494x = 669,300,699,664
5. Step 5: Solve for x
   x = 669,300,699,664/428,494
6. Step 6: Final answer
   x = 1,561,983.83