Finding the Fourth Proportional to 3,915.49, 5,871.50 and 2,815.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.49 : 5,871.50 = 2,815.25 : x
2. Step 2: Convert to fraction form
   3,915.49/5,871.50 = 2,815.25/x
3. Step 3: Cross multiply
   3,915.49x = 5,871.50 × 2,815.25
4. Step 4: Simplify right side
   3,915.49x = 16,529,726.30
5. Step 5: Solve for x
   x = 16,529,726.30/3,915.49
6. Step 6: Final answer
   x = 4,221.63