Finding the Third Proportional to 426,186 and 647,055

Step by Step Solution

1. Step 1: Write the proportion equation
   426,186 : 647,055 = 647,055 : x
2. Step 2: Convert to fraction form
   426,186/647,055 = 647,055/x
3. Step 3: Cross multiply
   426,186x = 647,055 × 647,055
4. Step 4: Simplify right side
   426,186x = 418,680,173,025
5. Step 5: Solve for x
   x = 418,680,173,025/426,186
6. Step 6: Final answer
   x = 982,388.38