Finding the Fourth Proportional to 3,419.52, 5,128.64 and 2,128.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,419.52 : 5,128.64 = 2,128.96 : x
2. Step 2: Convert to fraction form
   3,419.52/5,128.64 = 2,128.96/x
3. Step 3: Cross multiply
   3,419.52x = 5,128.64 × 2,128.96
4. Step 4: Simplify right side
   3,419.52x = 10,918,669.41
5. Step 5: Solve for x
   x = 10,918,669.41/3,419.52
6. Step 6: Final answer
   x = 3,193.04