Finding the Fourth Proportional to 2,320.06, 3,479.72 and 858.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,320.06 : 3,479.72 = 858.88 : x
2. Step 2: Convert to fraction form
   2,320.06/3,479.72 = 858.88/x
3. Step 3: Cross multiply
   2,320.06x = 3,479.72 × 858.88
4. Step 4: Simplify right side
   2,320.06x = 2,988,661.91
5. Step 5: Solve for x
   x = 2,988,661.91/2,320.06
6. Step 6: Final answer
   x = 1,288.18