Finding the Fourth Proportional to 3,940, 5,437.20 and 2,450.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940 : 5,437.20 = 2,450.72 : x
2. Step 2: Convert to fraction form
   3,940/5,437.20 = 2,450.72/x
3. Step 3: Cross multiply
   3,940x = 5,437.20 × 2,450.72
4. Step 4: Simplify right side
   3,940x = 13,325,054.78
5. Step 5: Solve for x
   x = 13,325,054.78/3,940
6. Step 6: Final answer
   x = 3,381.99