Finding the Third Proportional to 276,257.50 and 389,936

Step by Step Solution

1. Step 1: Write the proportion equation
   276,257.50 : 389,936 = 389,936 : x
2. Step 2: Convert to fraction form
   276,257.50/389,936 = 389,936/x
3. Step 3: Cross multiply
   276,257.50x = 389,936 × 389,936
4. Step 4: Simplify right side
   276,257.50x = 152,050,084,096
5. Step 5: Solve for x
   x = 152,050,084,096/276,257.50
6. Step 6: Final answer
   x = 550,392.60