Finding the Third Proportional to 289,777.78 and 622,404.56

Step by Step Solution

1. Step 1: Write the proportion equation
   289,777.78 : 622,404.56 = 622,404.56 : x
2. Step 2: Convert to fraction form
   289,777.78/622,404.56 = 622,404.56/x
3. Step 3: Cross multiply
   289,777.78x = 622,404.56 × 622,404.56
4. Step 4: Simplify right side
   289,777.78x = 387,387,439,420.82
5. Step 5: Solve for x
   x = 387,387,439,420.82/289,777.78
6. Step 6: Final answer
   x = 1,336,843.14