Finding the Fourth Proportional to 2,458.16, 3,389.28 and 2,142.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,458.16 : 3,389.28 = 2,142.28 : x
2. Step 2: Convert to fraction form
   2,458.16/3,389.28 = 2,142.28/x
3. Step 3: Cross multiply
   2,458.16x = 3,389.28 × 2,142.28
4. Step 4: Simplify right side
   2,458.16x = 7,260,786.76
5. Step 5: Solve for x
   x = 7,260,786.76/2,458.16
6. Step 6: Final answer
   x = 2,953.75