Finding the Third Proportional to 426,228 and 636,426

Step by Step Solution

1. Step 1: Write the proportion equation
   426,228 : 636,426 = 636,426 : x
2. Step 2: Convert to fraction form
   426,228/636,426 = 636,426/x
3. Step 3: Cross multiply
   426,228x = 636,426 × 636,426
4. Step 4: Simplify right side
   426,228x = 405,038,053,476
5. Step 5: Solve for x
   x = 405,038,053,476/426,228
6. Step 6: Final answer
   x = 950,284.95