Finding the Third Proportional to 313,456 and 687,002

Step by Step Solution

1. Step 1: Write the proportion equation
   313,456 : 687,002 = 687,002 : x
2. Step 2: Convert to fraction form
   313,456/687,002 = 687,002/x
3. Step 3: Cross multiply
   313,456x = 687,002 × 687,002
4. Step 4: Simplify right side
   313,456x = 471,971,748,004
5. Step 5: Solve for x
   x = 471,971,748,004/313,456
6. Step 6: Final answer
   x = 1,505,703.35