Finding the Fourth Proportional to 3,985.40, 5,494.15 and 2,658.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.40 : 5,494.15 = 2,658.62 : x
2. Step 2: Convert to fraction form
   3,985.40/5,494.15 = 2,658.62/x
3. Step 3: Cross multiply
   3,985.40x = 5,494.15 × 2,658.62
4. Step 4: Simplify right side
   3,985.40x = 14,606,857.07
5. Step 5: Solve for x
   x = 14,606,857.07/3,985.40
6. Step 6: Final answer
   x = 3,665.09