Finding the Third Proportional to 433,515 and 690,404.25

Step by Step Solution

1. Step 1: Write the proportion equation
   433,515 : 690,404.25 = 690,404.25 : x
2. Step 2: Convert to fraction form
   433,515/690,404.25 = 690,404.25/x
3. Step 3: Cross multiply
   433,515x = 690,404.25 × 690,404.25
4. Step 4: Simplify right side
   433,515x = 476,658,028,418.06
5. Step 5: Solve for x
   x = 476,658,028,418.06/433,515
6. Step 6: Final answer
   x = 1,099,519.11