Finding the Fourth Proportional to 3,934.30, 5,429.31 and 2,166.04

Step by Step Solution

1. Step 1: Write the proportion equation
   3,934.30 : 5,429.31 = 2,166.04 : x
2. Step 2: Convert to fraction form
   3,934.30/5,429.31 = 2,166.04/x
3. Step 3: Cross multiply
   3,934.30x = 5,429.31 × 2,166.04
4. Step 4: Simplify right side
   3,934.30x = 11,760,102.63
5. Step 5: Solve for x
   x = 11,760,102.63/3,934.30
6. Step 6: Final answer
   x = 2,989.12