Finding the Fourth Proportional to 419,139.31, 578,412.32 and 228,152.69

Step by Step Solution

1. Step 1: Write the proportion equation
   419,139.31 : 578,412.32 = 228,152.69 : x
2. Step 2: Convert to fraction form
   419,139.31/578,412.32 = 228,152.69/x
3. Step 3: Cross multiply
   419,139.31x = 578,412.32 × 228,152.69
4. Step 4: Simplify right side
   419,139.31x = 131,966,326,737.14
5. Step 5: Solve for x
   x = 131,966,326,737.14/419,139.31
6. Step 6: Final answer
   x = 314,850.75