Finding the Third Proportional to 259,618.50 and 558,018

Step by Step Solution

1. Step 1: Write the proportion equation
   259,618.50 : 558,018 = 558,018 : x
2. Step 2: Convert to fraction form
   259,618.50/558,018 = 558,018/x
3. Step 3: Cross multiply
   259,618.50x = 558,018 × 558,018
4. Step 4: Simplify right side
   259,618.50x = 311,384,088,324
5. Step 5: Solve for x
   x = 311,384,088,324/259,618.50
6. Step 6: Final answer
   x = 1,199,390.98