Finding the Fourth Proportional to 3,916.34, 5,404.80 and 2,587.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,916.34 : 5,404.80 = 2,587.71 : x
2. Step 2: Convert to fraction form
   3,916.34/5,404.80 = 2,587.71/x
3. Step 3: Cross multiply
   3,916.34x = 5,404.80 × 2,587.71
4. Step 4: Simplify right side
   3,916.34x = 13,986,055.01
5. Step 5: Solve for x
   x = 13,986,055.01/3,916.34
6. Step 6: Final answer
   x = 3,571.21