Finding the Third Proportional to 280,436 and 435,058

Step by Step Solution

1. Step 1: Write the proportion equation
   280,436 : 435,058 = 435,058 : x
2. Step 2: Convert to fraction form
   280,436/435,058 = 435,058/x
3. Step 3: Cross multiply
   280,436x = 435,058 × 435,058
4. Step 4: Simplify right side
   280,436x = 189,275,463,364
5. Step 5: Solve for x
   x = 189,275,463,364/280,436
6. Step 6: Final answer
   x = 674,932.83