Finding the Third Proportional to 206,404.31 and 290,662.31

Step by Step Solution

1. Step 1: Write the proportion equation
   206,404.31 : 290,662.31 = 290,662.31 : x
2. Step 2: Convert to fraction form
   206,404.31/290,662.31 = 290,662.31/x
3. Step 3: Cross multiply
   206,404.31x = 290,662.31 × 290,662.31
4. Step 4: Simplify right side
   206,404.31x = 84,484,579,907.85
5. Step 5: Solve for x
   x = 84,484,579,907.85/206,404.31
6. Step 6: Final answer
   x = 409,315.96