Finding the Fourth Proportional to 3,864.72, 5,333.24 and 2,139.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,864.72 : 5,333.24 = 2,139.96 : x
2. Step 2: Convert to fraction form
   3,864.72/5,333.24 = 2,139.96/x
3. Step 3: Cross multiply
   3,864.72x = 5,333.24 × 2,139.96
4. Step 4: Simplify right side
   3,864.72x = 11,412,920.27
5. Step 5: Solve for x
   x = 11,412,920.27/3,864.72
6. Step 6: Final answer
   x = 2,953.10