Finding the Fourth Proportional to 5,411.40, 8,111.62 and 2,123.20

Step by Step Solution

1. Step 1: Write the proportion equation
   5,411.40 : 8,111.62 = 2,123.20 : x
2. Step 2: Convert to fraction form
   5,411.40/8,111.62 = 2,123.20/x
3. Step 3: Cross multiply
   5,411.40x = 8,111.62 × 2,123.20
4. Step 4: Simplify right side
   5,411.40x = 17,222,591.58
5. Step 5: Solve for x
   x = 17,222,591.58/5,411.40
6. Step 6: Final answer
   x = 3,182.65