Finding the Third Proportional to 255,129.75 and 558,738

Step by Step Solution

1. Step 1: Write the proportion equation
   255,129.75 : 558,738 = 558,738 : x
2. Step 2: Convert to fraction form
   255,129.75/558,738 = 558,738/x
3. Step 3: Cross multiply
   255,129.75x = 558,738 × 558,738
4. Step 4: Simplify right side
   255,129.75x = 312,188,152,644
5. Step 5: Solve for x
   x = 312,188,152,644/255,129.75
6. Step 6: Final answer
   x = 1,223,644.65