Finding the Fourth Proportional to 3,145.10, 4,340.18 and 1,728.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,145.10 : 4,340.18 = 1,728.72 : x
2. Step 2: Convert to fraction form
   3,145.10/4,340.18 = 1,728.72/x
3. Step 3: Cross multiply
   3,145.10x = 4,340.18 × 1,728.72
4. Step 4: Simplify right side
   3,145.10x = 7,502,960.29
5. Step 5: Solve for x
   x = 7,502,960.29/3,145.10
6. Step 6: Final answer
   x = 2,385.61