Finding the Third Proportional to 122,845.50 and 258,813

Step by Step Solution

1. Step 1: Write the proportion equation
   122,845.50 : 258,813 = 258,813 : x
2. Step 2: Convert to fraction form
   122,845.50/258,813 = 258,813/x
3. Step 3: Cross multiply
   122,845.50x = 258,813 × 258,813
4. Step 4: Simplify right side
   122,845.50x = 66,984,168,969
5. Step 5: Solve for x
   x = 66,984,168,969/122,845.50
6. Step 6: Final answer
   x = 545,271.65