Finding the Fourth Proportional to 5,857.78, 8,080.69 and 3,969.46

Step by Step Solution

1. Step 1: Write the proportion equation
   5,857.78 : 8,080.69 = 3,969.46 : x
2. Step 2: Convert to fraction form
   5,857.78/8,080.69 = 3,969.46/x
3. Step 3: Cross multiply
   5,857.78x = 8,080.69 × 3,969.46
4. Step 4: Simplify right side
   5,857.78x = 32,075,975.73
5. Step 5: Solve for x
   x = 32,075,975.73/5,857.78
6. Step 6: Final answer
   x = 5,475.79