Finding the Fourth Proportional to 3,913.52, 5,400.72 and 2,145.11

Step by Step Solution

1. Step 1: Write the proportion equation
   3,913.52 : 5,400.72 = 2,145.11 : x
2. Step 2: Convert to fraction form
   3,913.52/5,400.72 = 2,145.11/x
3. Step 3: Cross multiply
   3,913.52x = 5,400.72 × 2,145.11
4. Step 4: Simplify right side
   3,913.52x = 11,585,111.48
5. Step 5: Solve for x
   x = 11,585,111.48/3,913.52
6. Step 6: Final answer
   x = 2,960.28