Finding the Fourth Proportional to 5,710.86, 7,871.56 and 3,821.76

Step by Step Solution

1. Step 1: Write the proportion equation
   5,710.86 : 7,871.56 = 3,821.76 : x
2. Step 2: Convert to fraction form
   5,710.86/7,871.56 = 3,821.76/x
3. Step 3: Cross multiply
   5,710.86x = 7,871.56 × 3,821.76
4. Step 4: Simplify right side
   5,710.86x = 30,083,213.15
5. Step 5: Solve for x
   x = 30,083,213.15/5,710.86
6. Step 6: Final answer
   x = 5,267.72