Finding the Third Proportional to 290,809.50 and 418,854

Step by Step Solution

1. Step 1: Write the proportion equation
   290,809.50 : 418,854 = 418,854 : x
2. Step 2: Convert to fraction form
   290,809.50/418,854 = 418,854/x
3. Step 3: Cross multiply
   290,809.50x = 418,854 × 418,854
4. Step 4: Simplify right side
   290,809.50x = 175,438,673,316
5. Step 5: Solve for x
   x = 175,438,673,316/290,809.50
6. Step 6: Final answer
   x = 603,276.97