Finding the Fourth Proportional to 3,913.99, 5,401.27 and 2,145.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,913.99 : 5,401.27 = 2,145.59 : x
2. Step 2: Convert to fraction form
   3,913.99/5,401.27 = 2,145.59/x
3. Step 3: Cross multiply
   3,913.99x = 5,401.27 × 2,145.59
4. Step 4: Simplify right side
   3,913.99x = 11,588,910.90
5. Step 5: Solve for x
   x = 11,588,910.90/3,913.99
6. Step 6: Final answer
   x = 2,960.89