Finding the Fourth Proportional to 3,910.79, 5,396.89 and 2,142.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,910.79 : 5,396.89 = 2,142.56 : x
2. Step 2: Convert to fraction form
   3,910.79/5,396.89 = 2,142.56/x
3. Step 3: Cross multiply
   3,910.79x = 5,396.89 × 2,142.56
4. Step 4: Simplify right side
   3,910.79x = 11,563,128.30
5. Step 5: Solve for x
   x = 11,563,128.30/3,910.79
6. Step 6: Final answer
   x = 2,956.73