Finding the Fourth Proportional to 419,288.56, 578,610.72 and 228,298.48

Step by Step Solution

1. Step 1: Write the proportion equation
   419,288.56 : 578,610.72 = 228,298.48 : x
2. Step 2: Convert to fraction form
   419,288.56/578,610.72 = 228,298.48/x
3. Step 3: Cross multiply
   419,288.56x = 578,610.72 × 228,298.48
4. Step 4: Simplify right side
   419,288.56x = 132,095,947,887.71
5. Step 5: Solve for x
   x = 132,095,947,887.71/419,288.56
6. Step 6: Final answer
   x = 315,047.82