Finding the Third Proportional to 276,399 and 580,648.50

Step by Step Solution

1. Step 1: Write the proportion equation
   276,399 : 580,648.50 = 580,648.50 : x
2. Step 2: Convert to fraction form
   276,399/580,648.50 = 580,648.50/x
3. Step 3: Cross multiply
   276,399x = 580,648.50 × 580,648.50
4. Step 4: Simplify right side
   276,399x = 337,152,680,552.25
5. Step 5: Solve for x
   x = 337,152,680,552.25/276,399
6. Step 6: Final answer
   x = 1,219,804.27