Finding the Third Proportional to 490,414 and 659,040

Step by Step Solution

1. Step 1: Write the proportion equation
   490,414 : 659,040 = 659,040 : x
2. Step 2: Convert to fraction form
   490,414/659,040 = 659,040/x
3. Step 3: Cross multiply
   490,414x = 659,040 × 659,040
4. Step 4: Simplify right side
   490,414x = 434,333,721,600
5. Step 5: Solve for x
   x = 434,333,721,600/490,414
6. Step 6: Final answer
   x = 885,647.07