Finding the Fourth Proportional to 419,227.95, 578,533.78 and 228,240.89

Step by Step Solution

1. Step 1: Write the proportion equation
   419,227.95 : 578,533.78 = 228,240.89 : x
2. Step 2: Convert to fraction form
   419,227.95/578,533.78 = 228,240.89/x
3. Step 3: Cross multiply
   419,227.95x = 578,533.78 × 228,240.89
4. Step 4: Simplify right side
   419,227.95x = 132,045,061,949.60
5. Step 5: Solve for x
   x = 132,045,061,949.60/419,227.95
6. Step 6: Final answer
   x = 314,971.99