Finding the Fourth Proportional to 3,921.50, 5,411.47 and 2,152.77

Step by Step Solution

1. Step 1: Write the proportion equation
   3,921.50 : 5,411.47 = 2,152.77 : x
2. Step 2: Convert to fraction form
   3,921.50/5,411.47 = 2,152.77/x
3. Step 3: Cross multiply
   3,921.50x = 5,411.47 × 2,152.77
4. Step 4: Simplify right side
   3,921.50x = 11,649,650.27
5. Step 5: Solve for x
   x = 11,649,650.27/3,921.50
6. Step 6: Final answer
   x = 2,970.71