Finding the Fourth Proportional to 2,087.28, 3,128.48 and 1,046.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.28 : 3,128.48 = 1,046.72 : x
2. Step 2: Convert to fraction form
   2,087.28/3,128.48 = 1,046.72/x
3. Step 3: Cross multiply
   2,087.28x = 3,128.48 × 1,046.72
4. Step 4: Simplify right side
   2,087.28x = 3,274,642.59
5. Step 5: Solve for x
   x = 3,274,642.59/2,087.28
6. Step 6: Final answer
   x = 1,568.86