Finding the Third Proportional to 258,813 and 553,605.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,813 : 553,605.50 = 553,605.50 : x
2. Step 2: Convert to fraction form
   258,813/553,605.50 = 553,605.50/x
3. Step 3: Cross multiply
   258,813x = 553,605.50 × 553,605.50
4. Step 4: Simplify right side
   258,813x = 306,479,049,630.25
5. Step 5: Solve for x
   x = 306,479,049,630.25/258,813
6. Step 6: Final answer
   x = 1,184,171.78