Finding the Fourth Proportional to 3,915.24, 5,403.28 and 2,586.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.24 : 5,403.28 = 2,586.62 : x
2. Step 2: Convert to fraction form
   3,915.24/5,403.28 = 2,586.62/x
3. Step 3: Cross multiply
   3,915.24x = 5,403.28 × 2,586.62
4. Step 4: Simplify right side
   3,915.24x = 13,976,225.07
5. Step 5: Solve for x
   x = 13,976,225.07/3,915.24
6. Step 6: Final answer
   x = 3,569.70