Finding the Third Proportional to 290,988 and 636,084

Step by Step Solution

1. Step 1: Write the proportion equation
   290,988 : 636,084 = 636,084 : x
2. Step 2: Convert to fraction form
   290,988/636,084 = 636,084/x
3. Step 3: Cross multiply
   290,988x = 636,084 × 636,084
4. Step 4: Simplify right side
   290,988x = 404,602,855,056
5. Step 5: Solve for x
   x = 404,602,855,056/290,988
6. Step 6: Final answer
   x = 1,390,445.16