Finding the Third Proportional to 687,236 and 1,421,610

Step by Step Solution

1. Step 1: Write the proportion equation
   687,236 : 1,421,610 = 1,421,610 : x
2. Step 2: Convert to fraction form
   687,236/1,421,610 = 1,421,610/x
3. Step 3: Cross multiply
   687,236x = 1,421,610 × 1,421,610
4. Step 4: Simplify right side
   687,236x = 2,020,974,992,100
5. Step 5: Solve for x
   x = 2,020,974,992,100/687,236
6. Step 6: Final answer
   x = 2,940,729.23