Finding the Third Proportional to 276,259.50 and 415,419

Step by Step Solution

1. Step 1: Write the proportion equation
   276,259.50 : 415,419 = 415,419 : x
2. Step 2: Convert to fraction form
   276,259.50/415,419 = 415,419/x
3. Step 3: Cross multiply
   276,259.50x = 415,419 × 415,419
4. Step 4: Simplify right side
   276,259.50x = 172,572,945,561
5. Step 5: Solve for x
   x = 172,572,945,561/276,259.50
6. Step 6: Final answer
   x = 624,676.96