Finding the Fourth Proportional to 3,928.86, 5,421.78 and 2,250.23

Step by Step Solution

1. Step 1: Write the proportion equation
   3,928.86 : 5,421.78 = 2,250.23 : x
2. Step 2: Convert to fraction form
   3,928.86/5,421.78 = 2,250.23/x
3. Step 3: Cross multiply
   3,928.86x = 5,421.78 × 2,250.23
4. Step 4: Simplify right side
   3,928.86x = 12,200,224.90
5. Step 5: Solve for x
   x = 12,200,224.90/3,928.86
6. Step 6: Final answer
   x = 3,105.28