Finding the Third Proportional to 389,619 and 527,980.50

Step by Step Solution

1. Step 1: Write the proportion equation
   389,619 : 527,980.50 = 527,980.50 : x
2. Step 2: Convert to fraction form
   389,619/527,980.50 = 527,980.50/x
3. Step 3: Cross multiply
   389,619x = 527,980.50 × 527,980.50
4. Step 4: Simplify right side
   389,619x = 278,763,408,380.25
5. Step 5: Solve for x
   x = 278,763,408,380.25/389,619
6. Step 6: Final answer
   x = 715,476.94