Finding the Fourth Proportional to 2,397.12, 3,597.12 and 858.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,397.12 : 3,597.12 = 858.24 : x
2. Step 2: Convert to fraction form
   2,397.12/3,597.12 = 858.24/x
3. Step 3: Cross multiply
   2,397.12x = 3,597.12 × 858.24
4. Step 4: Simplify right side
   2,397.12x = 3,087,192.27
5. Step 5: Solve for x
   x = 3,087,192.27/2,397.12
6. Step 6: Final answer
   x = 1,287.88