Finding the Fourth Proportional to 3,969.42, 5,475.59 and 3,687.84

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.42 : 5,475.59 = 3,687.84 : x
2. Step 2: Convert to fraction form
   3,969.42/5,475.59 = 3,687.84/x
3. Step 3: Cross multiply
   3,969.42x = 5,475.59 × 3,687.84
4. Step 4: Simplify right side
   3,969.42x = 20,193,081.39
5. Step 5: Solve for x
   x = 20,193,081.39/3,969.42
6. Step 6: Final answer
   x = 5,087.16