Finding the Fourth Proportional to 3,791.21, 5,665.67 and 3,580.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,791.21 : 5,665.67 = 3,580.61 : x
2. Step 2: Convert to fraction form
   3,791.21/5,665.67 = 3,580.61/x
3. Step 3: Cross multiply
   3,791.21x = 5,665.67 × 3,580.61
4. Step 4: Simplify right side
   3,791.21x = 20,286,554.66
5. Step 5: Solve for x
   x = 20,286,554.66/3,791.21
6. Step 6: Final answer
   x = 5,350.94