Finding the Fourth Proportional to 2,087.52, 3,128.99 and 1,265.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.52 : 3,128.99 = 1,265.57 : x
2. Step 2: Convert to fraction form
   2,087.52/3,128.99 = 1,265.57/x
3. Step 3: Cross multiply
   2,087.52x = 3,128.99 × 1,265.57
4. Step 4: Simplify right side
   2,087.52x = 3,959,955.87
5. Step 5: Solve for x
   x = 3,959,955.87/2,087.52
6. Step 6: Final answer
   x = 1,896.97