Finding the Third Proportional to 311,212 and 681,030

Step by Step Solution

1. Step 1: Write the proportion equation
   311,212 : 681,030 = 681,030 : x
2. Step 2: Convert to fraction form
   311,212/681,030 = 681,030/x
3. Step 3: Cross multiply
   311,212x = 681,030 × 681,030
4. Step 4: Simplify right side
   311,212x = 463,801,860,900
5. Step 5: Solve for x
   x = 463,801,860,900/311,212
6. Step 6: Final answer
   x = 1,490,308.41