Finding the Fourth Proportional to 3,928.86, 5,891.38 and 2,285.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,928.86 : 5,891.38 = 2,285.98 : x
2. Step 2: Convert to fraction form
   3,928.86/5,891.38 = 2,285.98/x
3. Step 3: Cross multiply
   3,928.86x = 5,891.38 × 2,285.98
4. Step 4: Simplify right side
   3,928.86x = 13,467,576.85
5. Step 5: Solve for x
   x = 13,467,576.85/3,928.86
6. Step 6: Final answer
   x = 3,427.86