Finding the Fourth Proportional to 3,928.83, 5,422.78 and 2,250.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,928.83 : 5,422.78 = 2,250.78 : x
2. Step 2: Convert to fraction form
   3,928.83/5,422.78 = 2,250.78/x
3. Step 3: Cross multiply
   3,928.83x = 5,422.78 × 2,250.78
4. Step 4: Simplify right side
   3,928.83x = 12,205,484.77
5. Step 5: Solve for x
   x = 12,205,484.77/3,928.83
6. Step 6: Final answer
   x = 3,106.65