Finding the Fourth Proportional to 2,859.32, 4,289.85 and 1,215.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,859.32 : 4,289.85 = 1,215.83 : x
2. Step 2: Convert to fraction form
   2,859.32/4,289.85 = 1,215.83/x
3. Step 3: Cross multiply
   2,859.32x = 4,289.85 × 1,215.83
4. Step 4: Simplify right side
   2,859.32x = 5,215,706.88
5. Step 5: Solve for x
   x = 5,215,706.88/2,859.32
6. Step 6: Final answer
   x = 1,824.11