Finding the Third Proportional to 258,178.50 and 559,245

Step by Step Solution

1. Step 1: Write the proportion equation
   258,178.50 : 559,245 = 559,245 : x
2. Step 2: Convert to fraction form
   258,178.50/559,245 = 559,245/x
3. Step 3: Cross multiply
   258,178.50x = 559,245 × 559,245
4. Step 4: Simplify right side
   258,178.50x = 312,754,970,025
5. Step 5: Solve for x
   x = 312,754,970,025/258,178.50
6. Step 6: Final answer
   x = 1,211,390.45