Finding the Fourth Proportional to 3,915.72, 5,402.75 and 2,236.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.72 : 5,402.75 = 2,236.91 : x
2. Step 2: Convert to fraction form
   3,915.72/5,402.75 = 2,236.91/x
3. Step 3: Cross multiply
   3,915.72x = 5,402.75 × 2,236.91
4. Step 4: Simplify right side
   3,915.72x = 12,085,427.30
5. Step 5: Solve for x
   x = 12,085,427.30/3,915.72
6. Step 6: Final answer
   x = 3,086.39