Finding the Fourth Proportional to 2,868.88, 4,302.72 and 1,287.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,868.88 : 4,302.72 = 1,287.76 : x
2. Step 2: Convert to fraction form
   2,868.88/4,302.72 = 1,287.76/x
3. Step 3: Cross multiply
   2,868.88x = 4,302.72 × 1,287.76
4. Step 4: Simplify right side
   2,868.88x = 5,540,870.71
5. Step 5: Solve for x
   x = 5,540,870.71/2,868.88
6. Step 6: Final answer
   x = 1,931.37