Finding the Fourth Proportional to 3,914.05, 5,401.35 and 2,145.65

Step by Step Solution

1. Step 1: Write the proportion equation
   3,914.05 : 5,401.35 = 2,145.65 : x
2. Step 2: Convert to fraction form
   3,914.05/5,401.35 = 2,145.65/x
3. Step 3: Cross multiply
   3,914.05x = 5,401.35 × 2,145.65
4. Step 4: Simplify right side
   3,914.05x = 11,589,406.63
5. Step 5: Solve for x
   x = 11,589,406.63/3,914.05
6. Step 6: Final answer
   x = 2,960.98