Finding the Fourth Proportional to 2,175.84, 3,261.92 and 1,078.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,175.84 : 3,261.92 = 1,078.72 : x
2. Step 2: Convert to fraction form
   2,175.84/3,261.92 = 1,078.72/x
3. Step 3: Cross multiply
   2,175.84x = 3,261.92 × 1,078.72
4. Step 4: Simplify right side
   2,175.84x = 3,518,698.34
5. Step 5: Solve for x
   x = 3,518,698.34/2,175.84
6. Step 6: Final answer
   x = 1,617.17