Finding the Third Proportional to 428,499 and 818,118

Step by Step Solution

1. Step 1: Write the proportion equation
   428,499 : 818,118 = 818,118 : x
2. Step 2: Convert to fraction form
   428,499/818,118 = 818,118/x
3. Step 3: Cross multiply
   428,499x = 818,118 × 818,118
4. Step 4: Simplify right side
   428,499x = 669,317,061,924
5. Step 5: Solve for x
   x = 669,317,061,924/428,499
6. Step 6: Final answer
   x = 1,562,003.79