Finding the Fourth Proportional to 3,921.60, 5,411.82 and 2,153.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,921.60 : 5,411.82 = 2,153.33 : x
2. Step 2: Convert to fraction form
   3,921.60/5,411.82 = 2,153.33/x
3. Step 3: Cross multiply
   3,921.60x = 5,411.82 × 2,153.33
4. Step 4: Simplify right side
   3,921.60x = 11,653,407.30
5. Step 5: Solve for x
   x = 11,653,407.30/3,921.60
6. Step 6: Final answer
   x = 2,971.59