Finding the Fourth Proportional to 678,964.72, 1,018,440.60 and 412,798.72

Step by Step Solution

1. Step 1: Write the proportion equation
   678,964.72 : 1,018,440.60 = 412,798.72 : x
2. Step 2: Convert to fraction form
   678,964.72/1,018,440.60 = 412,798.72/x
3. Step 3: Cross multiply
   678,964.72x = 1,018,440.60 × 412,798.72
4. Step 4: Simplify right side
   678,964.72x = 420,410,976,076.03
5. Step 5: Solve for x
   x = 420,410,976,076.03/678,964.72
6. Step 6: Final answer
   x = 619,194.14