Finding the Third Proportional to 259,656 and 558,090

Step by Step Solution

1. Step 1: Write the proportion equation
   259,656 : 558,090 = 558,090 : x
2. Step 2: Convert to fraction form
   259,656/558,090 = 558,090/x
3. Step 3: Cross multiply
   259,656x = 558,090 × 558,090
4. Step 4: Simplify right side
   259,656x = 311,464,448,100
5. Step 5: Solve for x
   x = 311,464,448,100/259,656
6. Step 6: Final answer
   x = 1,199,527.25