Finding the Fourth Proportional to 2,828.58, 4,240.71 and 1,288.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,828.58 : 4,240.71 = 1,288.50 : x
2. Step 2: Convert to fraction form
   2,828.58/4,240.71 = 1,288.50/x
3. Step 3: Cross multiply
   2,828.58x = 4,240.71 × 1,288.50
4. Step 4: Simplify right side
   2,828.58x = 5,464,154.84
5. Step 5: Solve for x
   x = 5,464,154.84/2,828.58
6. Step 6: Final answer
   x = 1,931.77