Finding the Fourth Proportional to 3,934.55, 5,429.52 and 2,166.14

Step by Step Solution

1. Step 1: Write the proportion equation
   3,934.55 : 5,429.52 = 2,166.14 : x
2. Step 2: Convert to fraction form
   3,934.55/5,429.52 = 2,166.14/x
3. Step 3: Cross multiply
   3,934.55x = 5,429.52 × 2,166.14
4. Step 4: Simplify right side
   3,934.55x = 11,761,100.45
5. Step 5: Solve for x
   x = 11,761,100.45/3,934.55
6. Step 6: Final answer
   x = 2,989.19