Finding the Third Proportional to 426,231 and 636,429

Step by Step Solution

1. Step 1: Write the proportion equation
   426,231 : 636,429 = 636,429 : x
2. Step 2: Convert to fraction form
   426,231/636,429 = 636,429/x
3. Step 3: Cross multiply
   426,231x = 636,429 × 636,429
4. Step 4: Simplify right side
   426,231x = 405,041,872,041
5. Step 5: Solve for x
   x = 405,041,872,041/426,231
6. Step 6: Final answer
   x = 950,287.22