Finding the Fourth Proportional to 3,145.92, 4,718.72 and 1,171.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,145.92 : 4,718.72 = 1,171.55 : x
2. Step 2: Convert to fraction form
   3,145.92/4,718.72 = 1,171.55/x
3. Step 3: Cross multiply
   3,145.92x = 4,718.72 × 1,171.55
4. Step 4: Simplify right side
   3,145.92x = 5,528,216.42
5. Step 5: Solve for x
   x = 5,528,216.42/3,145.92
6. Step 6: Final answer
   x = 1,757.27