Finding the Third Proportional to 311,058 and 666,180

Step by Step Solution

1. Step 1: Write the proportion equation
   311,058 : 666,180 = 666,180 : x
2. Step 2: Convert to fraction form
   311,058/666,180 = 666,180/x
3. Step 3: Cross multiply
   311,058x = 666,180 × 666,180
4. Step 4: Simplify right side
   311,058x = 443,795,792,400
5. Step 5: Solve for x
   x = 443,795,792,400/311,058
6. Step 6: Final answer
   x = 1,426,730.04