Finding the Fourth Proportional to 5,722.12, 7,891.86 and 3,858.76

Step by Step Solution

1. Step 1: Write the proportion equation
   5,722.12 : 7,891.86 = 3,858.76 : x
2. Step 2: Convert to fraction form
   5,722.12/7,891.86 = 3,858.76/x
3. Step 3: Cross multiply
   5,722.12x = 7,891.86 × 3,858.76
4. Step 4: Simplify right side
   5,722.12x = 30,452,793.69
5. Step 5: Solve for x
   x = 30,452,793.69/5,722.12
6. Step 6: Final answer
   x = 5,321.94