Finding the Fourth Proportional to 3,921.27, 5,411.18 and 2,152.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,921.27 : 5,411.18 = 2,152.91 : x
2. Step 2: Convert to fraction form
   3,921.27/5,411.18 = 2,152.91/x
3. Step 3: Cross multiply
   3,921.27x = 5,411.18 × 2,152.91
4. Step 4: Simplify right side
   3,921.27x = 11,649,761.86
5. Step 5: Solve for x
   x = 11,649,761.86/3,921.27
6. Step 6: Final answer
   x = 2,970.92