Finding the Third Proportional to 258,858 and 530,259.75

Step by Step Solution

1. Step 1: Write the proportion equation
   258,858 : 530,259.75 = 530,259.75 : x
2. Step 2: Convert to fraction form
   258,858/530,259.75 = 530,259.75/x
3. Step 3: Cross multiply
   258,858x = 530,259.75 × 530,259.75
4. Step 4: Simplify right side
   258,858x = 281,175,402,470.06
5. Step 5: Solve for x
   x = 281,175,402,470.06/258,858
6. Step 6: Final answer
   x = 1,086,214.85