Finding the Fourth Proportional to 3,938.50, 5,435.67 and 2,540.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,938.50 : 5,435.67 = 2,540.98 : x
2. Step 2: Convert to fraction form
   3,938.50/5,435.67 = 2,540.98/x
3. Step 3: Cross multiply
   3,938.50x = 5,435.67 × 2,540.98
4. Step 4: Simplify right side
   3,938.50x = 13,811,928.76
5. Step 5: Solve for x
   x = 13,811,928.76/3,938.50
6. Step 6: Final answer
   x = 3,506.90