Finding the Third Proportional to 426,280 and 636,490

Step by Step Solution

1. Step 1: Write the proportion equation
   426,280 : 636,490 = 636,490 : x
2. Step 2: Convert to fraction form
   426,280/636,490 = 636,490/x
3. Step 3: Cross multiply
   426,280x = 636,490 × 636,490
4. Step 4: Simplify right side
   426,280x = 405,119,520,100
5. Step 5: Solve for x
   x = 405,119,520,100/426,280
6. Step 6: Final answer
   x = 950,360.14