Finding the Fourth Proportional to 3,934.72, 5,429.71 and 2,166

Step by Step Solution

1. Step 1: Write the proportion equation
   3,934.72 : 5,429.71 = 2,166 : x
2. Step 2: Convert to fraction form
   3,934.72/5,429.71 = 2,166/x
3. Step 3: Cross multiply
   3,934.72x = 5,429.71 × 2,166
4. Step 4: Simplify right side
   3,934.72x = 11,760,751.86
5. Step 5: Solve for x
   x = 11,760,751.86/3,934.72
6. Step 6: Final answer
   x = 2,988.97