Finding the Fourth Proportional to 394,912.73, 544,978.94 and 213,624.10

Step by Step Solution

1. Step 1: Write the proportion equation
   394,912.73 : 544,978.94 = 213,624.10 : x
2. Step 2: Convert to fraction form
   394,912.73/544,978.94 = 213,624.10/x
3. Step 3: Cross multiply
   394,912.73x = 544,978.94 × 213,624.10
4. Step 4: Simplify right side
   394,912.73x = 116,420,633,325.69
5. Step 5: Solve for x
   x = 116,420,633,325.69/394,912.73
6. Step 6: Final answer
   x = 294,800.92