Finding the Third Proportional to 103,679 and 213,900

Step by Step Solution

1. Step 1: Write the proportion equation
   103,679 : 213,900 = 213,900 : x
2. Step 2: Convert to fraction form
   103,679/213,900 = 213,900/x
3. Step 3: Cross multiply
   103,679x = 213,900 × 213,900
4. Step 4: Simplify right side
   103,679x = 45,753,210,000
5. Step 5: Solve for x
   x = 45,753,210,000/103,679
6. Step 6: Final answer
   x = 441,296.79