Finding the Fourth Proportional to 678,960.72, 1,018,434.60 and 412,794.72

Step by Step Solution

1. Step 1: Write the proportion equation
   678,960.72 : 1,018,434.60 = 412,794.72 : x
2. Step 2: Convert to fraction form
   678,960.72/1,018,434.60 = 412,794.72/x
3. Step 3: Cross multiply
   678,960.72x = 1,018,434.60 × 412,794.72
4. Step 4: Simplify right side
   678,960.72x = 420,404,425,545.31
5. Step 5: Solve for x
   x = 420,404,425,545.31/678,960.72
6. Step 6: Final answer
   x = 619,188.14