Finding the Third Proportional to 259,806 and 558,288.75

Step by Step Solution

1. Step 1: Write the proportion equation
   259,806 : 558,288.75 = 558,288.75 : x
2. Step 2: Convert to fraction form
   259,806/558,288.75 = 558,288.75/x
3. Step 3: Cross multiply
   259,806x = 558,288.75 × 558,288.75
4. Step 4: Simplify right side
   259,806x = 311,686,328,376.56
5. Step 5: Solve for x
   x = 311,686,328,376.56/259,806
6. Step 6: Final answer
   x = 1,199,688.72