Finding the Third Proportional to 255,591.50 and 400,980

Step by Step Solution

1. Step 1: Write the proportion equation
   255,591.50 : 400,980 = 400,980 : x
2. Step 2: Convert to fraction form
   255,591.50/400,980 = 400,980/x
3. Step 3: Cross multiply
   255,591.50x = 400,980 × 400,980
4. Step 4: Simplify right side
   255,591.50x = 160,784,960,400
5. Step 5: Solve for x
   x = 160,784,960,400/255,591.50
6. Step 6: Final answer
   x = 629,070.06