Finding the Third Proportional to 276,839 and 431,650.50

Step by Step Solution

1. Step 1: Write the proportion equation
   276,839 : 431,650.50 = 431,650.50 : x
2. Step 2: Convert to fraction form
   276,839/431,650.50 = 431,650.50/x
3. Step 3: Cross multiply
   276,839x = 431,650.50 × 431,650.50
4. Step 4: Simplify right side
   276,839x = 186,322,154,150.25
5. Step 5: Solve for x
   x = 186,322,154,150.25/276,839
6. Step 6: Final answer
   x = 673,034.34