Finding the Fourth Proportional to 3,918.16, 5,878.52 and 1,728.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,918.16 : 5,878.52 = 1,728.72 : x
2. Step 2: Convert to fraction form
   3,918.16/5,878.52 = 1,728.72/x
3. Step 3: Cross multiply
   3,918.16x = 5,878.52 × 1,728.72
4. Step 4: Simplify right side
   3,918.16x = 10,162,315.09
5. Step 5: Solve for x
   x = 10,162,315.09/3,918.16
6. Step 6: Final answer
   x = 2,593.64