Finding the Fourth Proportional to 3,921.32, 5,411.45 and 2,152.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,921.32 : 5,411.45 = 2,152.96 : x
2. Step 2: Convert to fraction form
   3,921.32/5,411.45 = 2,152.96/x
3. Step 3: Cross multiply
   3,921.32x = 5,411.45 × 2,152.96
4. Step 4: Simplify right side
   3,921.32x = 11,650,627.25
5. Step 5: Solve for x
   x = 11,650,627.25/3,921.32
6. Step 6: Final answer
   x = 2,971.10