Finding the Third Proportional to 311,215.50 and 480,636

Step by Step Solution

1. Step 1: Write the proportion equation
   311,215.50 : 480,636 = 480,636 : x
2. Step 2: Convert to fraction form
   311,215.50/480,636 = 480,636/x
3. Step 3: Cross multiply
   311,215.50x = 480,636 × 480,636
4. Step 4: Simplify right side
   311,215.50x = 231,010,964,496
5. Step 5: Solve for x
   x = 231,010,964,496/311,215.50
6. Step 6: Final answer
   x = 742,286.18