Finding the Fourth Proportional to 3,915.34, 5,403.42 and 2,586.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.34 : 5,403.42 = 2,586.71 : x
2. Step 2: Convert to fraction form
   3,915.34/5,403.42 = 2,586.71/x
3. Step 3: Cross multiply
   3,915.34x = 5,403.42 × 2,586.71
4. Step 4: Simplify right side
   3,915.34x = 13,977,067.61
5. Step 5: Solve for x
   x = 13,977,067.61/3,915.34
6. Step 6: Final answer
   x = 3,569.83