Finding the Third Proportional to 289,658 and 622,900

Step by Step Solution

1. Step 1: Write the proportion equation
   289,658 : 622,900 = 622,900 : x
2. Step 2: Convert to fraction form
   289,658/622,900 = 622,900/x
3. Step 3: Cross multiply
   289,658x = 622,900 × 622,900
4. Step 4: Simplify right side
   289,658x = 388,004,410,000
5. Step 5: Solve for x
   x = 388,004,410,000/289,658
6. Step 6: Final answer
   x = 1,339,525.96