Finding the Fourth Proportional to 3,910.64, 5,396.72 and 2,142.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,910.64 : 5,396.72 = 2,142.42 : x
2. Step 2: Convert to fraction form
   3,910.64/5,396.72 = 2,142.42/x
3. Step 3: Cross multiply
   3,910.64x = 5,396.72 × 2,142.42
4. Step 4: Simplify right side
   3,910.64x = 11,562,040.86
5. Step 5: Solve for x
   x = 11,562,040.86/3,910.64
6. Step 6: Final answer
   x = 2,956.56