Finding the Third Proportional to 311,036 and 666,288

Step by Step Solution

1. Step 1: Write the proportion equation
   311,036 : 666,288 = 666,288 : x
2. Step 2: Convert to fraction form
   311,036/666,288 = 666,288/x
3. Step 3: Cross multiply
   311,036x = 666,288 × 666,288
4. Step 4: Simplify right side
   311,036x = 443,939,698,944
5. Step 5: Solve for x
   x = 443,939,698,944/311,036
6. Step 6: Final answer
   x = 1,427,293.62