Finding the Fourth Proportional to 2,128.82, 3,195.20 and 1,089.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.82 : 3,195.20 = 1,089.58 : x
2. Step 2: Convert to fraction form
   2,128.82/3,195.20 = 1,089.58/x
3. Step 3: Cross multiply
   2,128.82x = 3,195.20 × 1,089.58
4. Step 4: Simplify right side
   2,128.82x = 3,481,426.02
5. Step 5: Solve for x
   x = 3,481,426.02/2,128.82
6. Step 6: Final answer
   x = 1,635.38