Finding the Fourth Proportional to 2,128.52, 3,190.88 and 1,031.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.52 : 3,190.88 = 1,031.78 : x
2. Step 2: Convert to fraction form
   2,128.52/3,190.88 = 1,031.78/x
3. Step 3: Cross multiply
   2,128.52x = 3,190.88 × 1,031.78
4. Step 4: Simplify right side
   2,128.52x = 3,292,286.17
5. Step 5: Solve for x
   x = 3,292,286.17/2,128.52
6. Step 6: Final answer
   x = 1,546.75