Finding the Third Proportional to 276,456 and 439,591.50

Step by Step Solution

1. Step 1: Write the proportion equation
   276,456 : 439,591.50 = 439,591.50 : x
2. Step 2: Convert to fraction form
   276,456/439,591.50 = 439,591.50/x
3. Step 3: Cross multiply
   276,456x = 439,591.50 × 439,591.50
4. Step 4: Simplify right side
   276,456x = 193,240,686,872.25
5. Step 5: Solve for x
   x = 193,240,686,872.25/276,456
6. Step 6: Final answer
   x = 698,992.56