Finding the Fourth Proportional to 678,966.72, 1,018,443.60 and 412,800.72

Step by Step Solution

1. Step 1: Write the proportion equation
   678,966.72 : 1,018,443.60 = 412,800.72 : x
2. Step 2: Convert to fraction form
   678,966.72/1,018,443.60 = 412,800.72/x
3. Step 3: Cross multiply
   678,966.72x = 1,018,443.60 × 412,800.72
4. Step 4: Simplify right side
   678,966.72x = 420,414,251,359.39
5. Step 5: Solve for x
   x = 420,414,251,359.39/678,966.72
6. Step 6: Final answer
   x = 619,197.14