Finding the Fourth Proportional to 3,451.72, 5,178.54 and 1,143.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,451.72 : 5,178.54 = 1,143.28 : x
2. Step 2: Convert to fraction form
   3,451.72/5,178.54 = 1,143.28/x
3. Step 3: Cross multiply
   3,451.72x = 5,178.54 × 1,143.28
4. Step 4: Simplify right side
   3,451.72x = 5,920,521.21
5. Step 5: Solve for x
   x = 5,920,521.21/3,451.72
6. Step 6: Final answer
   x = 1,715.24