Finding the Third Proportional to 289,443 and 617,118

Step by Step Solution

1. Step 1: Write the proportion equation
   289,443 : 617,118 = 617,118 : x
2. Step 2: Convert to fraction form
   289,443/617,118 = 617,118/x
3. Step 3: Cross multiply
   289,443x = 617,118 × 617,118
4. Step 4: Simplify right side
   289,443x = 380,834,625,924
5. Step 5: Solve for x
   x = 380,834,625,924/289,443
6. Step 6: Final answer
   x = 1,315,750.00