Finding the Third Proportional to 239,689 and 520,120.50

Step by Step Solution

1. Step 1: Write the proportion equation
   239,689 : 520,120.50 = 520,120.50 : x
2. Step 2: Convert to fraction form
   239,689/520,120.50 = 520,120.50/x
3. Step 3: Cross multiply
   239,689x = 520,120.50 × 520,120.50
4. Step 4: Simplify right side
   239,689x = 270,525,334,520.25
5. Step 5: Solve for x
   x = 270,525,334,520.25/239,689
6. Step 6: Final answer
   x = 1,128,651.44