Finding the Fourth Proportional to 3,789.91, 5,679.69 and 2,864.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,789.91 : 5,679.69 = 2,864.71 : x
2. Step 2: Convert to fraction form
   3,789.91/5,679.69 = 2,864.71/x
3. Step 3: Cross multiply
   3,789.91x = 5,679.69 × 2,864.71
4. Step 4: Simplify right side
   3,789.91x = 16,270,664.74
5. Step 5: Solve for x
   x = 16,270,664.74/3,789.91
6. Step 6: Final answer
   x = 4,293.15