Finding the Third Proportional to 361,872 and 500,040

Step by Step Solution

1. Step 1: Write the proportion equation
   361,872 : 500,040 = 500,040 : x
2. Step 2: Convert to fraction form
   361,872/500,040 = 500,040/x
3. Step 3: Cross multiply
   361,872x = 500,040 × 500,040
4. Step 4: Simplify right side
   361,872x = 250,040,001,600
5. Step 5: Solve for x
   x = 250,040,001,600/361,872
6. Step 6: Final answer
   x = 690,962.55