Finding the Fourth Proportional to 3,916.43, 5,404.72 and 2,147.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,916.43 : 5,404.72 = 2,147.91 : x
2. Step 2: Convert to fraction form
   3,916.43/5,404.72 = 2,147.91/x
3. Step 3: Cross multiply
   3,916.43x = 5,404.72 × 2,147.91
4. Step 4: Simplify right side
   3,916.43x = 11,608,852.14
5. Step 5: Solve for x
   x = 11,608,852.14/3,916.43
6. Step 6: Final answer
   x = 2,964.15