Finding the Fourth Proportional to 2,128.24, 3,192.69 and 1,087.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.24 : 3,192.69 = 1,087.67 : x
2. Step 2: Convert to fraction form
   2,128.24/3,192.69 = 1,087.67/x
3. Step 3: Cross multiply
   2,128.24x = 3,192.69 × 1,087.67
4. Step 4: Simplify right side
   2,128.24x = 3,472,601.11
5. Step 5: Solve for x
   x = 3,472,601.11/2,128.24
6. Step 6: Final answer
   x = 1,631.68