Finding the Third Proportional to 311,184 and 666,648

Step by Step Solution

1. Step 1: Write the proportion equation
   311,184 : 666,648 = 666,648 : x
2. Step 2: Convert to fraction form
   311,184/666,648 = 666,648/x
3. Step 3: Cross multiply
   311,184x = 666,648 × 666,648
4. Step 4: Simplify right side
   311,184x = 444,419,555,904
5. Step 5: Solve for x
   x = 444,419,555,904/311,184
6. Step 6: Final answer
   x = 1,428,156.83