Finding the Fourth Proportional to 3,915.50, 5,402.85 and 2,236.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.50 : 5,402.85 = 2,236.79 : x
2. Step 2: Convert to fraction form
   3,915.50/5,402.85 = 2,236.79/x
3. Step 3: Cross multiply
   3,915.50x = 5,402.85 × 2,236.79
4. Step 4: Simplify right side
   3,915.50x = 12,085,013.84
5. Step 5: Solve for x
   x = 12,085,013.84/3,915.50
6. Step 6: Final answer
   x = 3,086.46