Finding the Third Proportional to 258,160.50 and 559,218

Step by Step Solution

1. Step 1: Write the proportion equation
   258,160.50 : 559,218 = 559,218 : x
2. Step 2: Convert to fraction form
   258,160.50/559,218 = 559,218/x
3. Step 3: Cross multiply
   258,160.50x = 559,218 × 559,218
4. Step 4: Simplify right side
   258,160.50x = 312,724,771,524
5. Step 5: Solve for x
   x = 312,724,771,524/258,160.50
6. Step 6: Final answer
   x = 1,211,357.94