Finding the Third Proportional to 290,898 and 617,010

Step by Step Solution

1. Step 1: Write the proportion equation
   290,898 : 617,010 = 617,010 : x
2. Step 2: Convert to fraction form
   290,898/617,010 = 617,010/x
3. Step 3: Cross multiply
   290,898x = 617,010 × 617,010
4. Step 4: Simplify right side
   290,898x = 380,701,340,100
5. Step 5: Solve for x
   x = 380,701,340,100/290,898
6. Step 6: Final answer
   x = 1,308,710.75