Finding the Fourth Proportional to 2,397.76, 3,596.68 and 858.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,397.76 : 3,596.68 = 858.72 : x
2. Step 2: Convert to fraction form
   2,397.76/3,596.68 = 858.72/x
3. Step 3: Cross multiply
   2,397.76x = 3,596.68 × 858.72
4. Step 4: Simplify right side
   2,397.76x = 3,088,541.05
5. Step 5: Solve for x
   x = 3,088,541.05/2,397.76
6. Step 6: Final answer
   x = 1,288.09