Finding the Third Proportional to 539,421 and 777,019.50

Step by Step Solution

1. Step 1: Write the proportion equation
   539,421 : 777,019.50 = 777,019.50 : x
2. Step 2: Convert to fraction form
   539,421/777,019.50 = 777,019.50/x
3. Step 3: Cross multiply
   539,421x = 777,019.50 × 777,019.50
4. Step 4: Simplify right side
   539,421x = 603,759,303,380.25
5. Step 5: Solve for x
   x = 603,759,303,380.25/539,421
6. Step 6: Final answer
   x = 1,119,272.89