Finding the Fourth Proportional to 419,141.32, 578,244.18 and 257,947.72

Step by Step Solution

1. Step 1: Write the proportion equation
   419,141.32 : 578,244.18 = 257,947.72 : x
2. Step 2: Convert to fraction form
   419,141.32/578,244.18 = 257,947.72/x
3. Step 3: Cross multiply
   419,141.32x = 578,244.18 × 257,947.72
4. Step 4: Simplify right side
   419,141.32x = 149,156,767,834.27
5. Step 5: Solve for x
   x = 149,156,767,834.27/419,141.32
6. Step 6: Final answer
   x = 355,862.71