Finding the Fourth Proportional to 2,128.11, 3,192.50 and 1,087.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.11 : 3,192.50 = 1,087.55 : x
2. Step 2: Convert to fraction form
   2,128.11/3,192.50 = 1,087.55/x
3. Step 3: Cross multiply
   2,128.11x = 3,192.50 × 1,087.55
4. Step 4: Simplify right side
   2,128.11x = 3,471,995.39
5. Step 5: Solve for x
   x = 3,471,995.39/2,128.11
6. Step 6: Final answer
   x = 1,631.49