Finding the Fourth Proportional to 3,605.40, 5,381.91 and 3,168

Step by Step Solution

1. Step 1: Write the proportion equation
   3,605.40 : 5,381.91 = 3,168 : x
2. Step 2: Convert to fraction form
   3,605.40/5,381.91 = 3,168/x
3. Step 3: Cross multiply
   3,605.40x = 5,381.91 × 3,168
4. Step 4: Simplify right side
   3,605.40x = 17,049,890.88
5. Step 5: Solve for x
   x = 17,049,890.88/3,605.40
6. Step 6: Final answer
   x = 4,728.99