Finding the Fourth Proportional to 396,123, 546,650.64 and 226,356.72

Step by Step Solution

1. Step 1: Write the proportion equation
   396,123 : 546,650.64 = 226,356.72 : x
2. Step 2: Convert to fraction form
   396,123/546,650.64 = 226,356.72/x
3. Step 3: Cross multiply
   396,123x = 546,650.64 × 226,356.72
4. Step 4: Simplify right side
   396,123x = 123,738,045,856.30
5. Step 5: Solve for x
   x = 123,738,045,856.30/396,123
6. Step 6: Final answer
   x = 312,372.79