Finding the Third Proportional to 321,118.50 and 500,058

Step by Step Solution

1. Step 1: Write the proportion equation
   321,118.50 : 500,058 = 500,058 : x
2. Step 2: Convert to fraction form
   321,118.50/500,058 = 500,058/x
3. Step 3: Cross multiply
   321,118.50x = 500,058 × 500,058
4. Step 4: Simplify right side
   321,118.50x = 250,058,003,364
5. Step 5: Solve for x
   x = 250,058,003,364/321,118.50
6. Step 6: Final answer
   x = 778,709.43