Finding the Third Proportional to 121,212 and 263,786.50

Step by Step Solution

1. Step 1: Write the proportion equation
   121,212 : 263,786.50 = 263,786.50 : x
2. Step 2: Convert to fraction form
   121,212/263,786.50 = 263,786.50/x
3. Step 3: Cross multiply
   121,212x = 263,786.50 × 263,786.50
4. Step 4: Simplify right side
   121,212x = 69,583,317,582.25
5. Step 5: Solve for x
   x = 69,583,317,582.25/121,212
6. Step 6: Final answer
   x = 574,062.94