Finding the Fourth Proportional to 3,928.86, 5,421.42 and 2,250.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,928.86 : 5,421.42 = 2,250.09 : x
2. Step 2: Convert to fraction form
   3,928.86/5,421.42 = 2,250.09/x
3. Step 3: Cross multiply
   3,928.86x = 5,421.42 × 2,250.09
4. Step 4: Simplify right side
   3,928.86x = 12,198,682.93
5. Step 5: Solve for x
   x = 12,198,682.93/3,928.86
6. Step 6: Final answer
   x = 3,104.89