Finding the Third Proportional to 311,238 and 480,666

Step by Step Solution

1. Step 1: Write the proportion equation
   311,238 : 480,666 = 480,666 : x
2. Step 2: Convert to fraction form
   311,238/480,666 = 480,666/x
3. Step 3: Cross multiply
   311,238x = 480,666 × 480,666
4. Step 4: Simplify right side
   311,238x = 231,039,803,556
5. Step 5: Solve for x
   x = 231,039,803,556/311,238
6. Step 6: Final answer
   x = 742,325.18