Finding the Fourth Proportional to 2,175.20, 3,002.88 and 1,291.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,175.20 : 3,002.88 = 1,291.28 : x
2. Step 2: Convert to fraction form
   2,175.20/3,002.88 = 1,291.28/x
3. Step 3: Cross multiply
   2,175.20x = 3,002.88 × 1,291.28
4. Step 4: Simplify right side
   2,175.20x = 3,877,558.89
5. Step 5: Solve for x
   x = 3,877,558.89/2,175.20
6. Step 6: Final answer
   x = 1,782.62