Finding the Fourth Proportional to 3,913.72, 5,400.91 and 2,145.29

Step by Step Solution

1. Step 1: Write the proportion equation
   3,913.72 : 5,400.91 = 2,145.29 : x
2. Step 2: Convert to fraction form
   3,913.72/5,400.91 = 2,145.29/x
3. Step 3: Cross multiply
   3,913.72x = 5,400.91 × 2,145.29
4. Step 4: Simplify right side
   3,913.72x = 11,586,493.89
5. Step 5: Solve for x
   x = 11,586,493.89/3,913.72
6. Step 6: Final answer
   x = 2,960.48