Finding the Third Proportional to 322,870 and 637,460

Step by Step Solution

1. Step 1: Write the proportion equation
   322,870 : 637,460 = 637,460 : x
2. Step 2: Convert to fraction form
   322,870/637,460 = 637,460/x
3. Step 3: Cross multiply
   322,870x = 637,460 × 637,460
4. Step 4: Simplify right side
   322,870x = 406,355,251,600
5. Step 5: Solve for x
   x = 406,355,251,600/322,870
6. Step 6: Final answer
   x = 1,258,572.34