Finding the Fourth Proportional to 5,725.77, 7,890.81 and 3,933.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,725.77 : 7,890.81 = 3,933.78 : x
2. Step 2: Convert to fraction form
   5,725.77/7,890.81 = 3,933.78/x
3. Step 3: Cross multiply
   5,725.77x = 7,890.81 × 3,933.78
4. Step 4: Simplify right side
   5,725.77x = 31,040,710.56
5. Step 5: Solve for x
   x = 31,040,710.56/5,725.77
6. Step 6: Final answer
   x = 5,421.23