Finding the Third Proportional to 345,979 and 487,003

Step by Step Solution

1. Step 1: Write the proportion equation
   345,979 : 487,003 = 487,003 : x
2. Step 2: Convert to fraction form
   345,979/487,003 = 487,003/x
3. Step 3: Cross multiply
   345,979x = 487,003 × 487,003
4. Step 4: Simplify right side
   345,979x = 237,171,922,009
5. Step 5: Solve for x
   x = 237,171,922,009/345,979
6. Step 6: Final answer
   x = 685,509.59