Finding the Fourth Proportional to 3,916.10, 5,404.50 and 2,147.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,916.10 : 5,404.50 = 2,147.87 : x
2. Step 2: Convert to fraction form
   3,916.10/5,404.50 = 2,147.87/x
3. Step 3: Cross multiply
   3,916.10x = 5,404.50 × 2,147.87
4. Step 4: Simplify right side
   3,916.10x = 11,608,136.39
5. Step 5: Solve for x
   x = 11,608,136.39/3,916.10
6. Step 6: Final answer
   x = 2,964.21