Finding the Third Proportional to 262,300.50 and 398,580

Step by Step Solution

1. Step 1: Write the proportion equation
   262,300.50 : 398,580 = 398,580 : x
2. Step 2: Convert to fraction form
   262,300.50/398,580 = 398,580/x
3. Step 3: Cross multiply
   262,300.50x = 398,580 × 398,580
4. Step 4: Simplify right side
   262,300.50x = 158,866,016,400
5. Step 5: Solve for x
   x = 158,866,016,400/262,300.50
6. Step 6: Final answer
   x = 605,664.18