Finding the Third Proportional to 290,806.88 and 418,849.31

Step by Step Solution

1. Step 1: Write the proportion equation
   290,806.88 : 418,849.31 = 418,849.31 : x
2. Step 2: Convert to fraction form
   290,806.88/418,849.31 = 418,849.31/x
3. Step 3: Cross multiply
   290,806.88x = 418,849.31 × 418,849.31
4. Step 4: Simplify right side
   290,806.88x = 175,434,746,581.72
5. Step 5: Solve for x
   x = 175,434,746,581.72/290,806.88
6. Step 6: Final answer
   x = 603,268.91