Finding the Fourth Proportional to 2,653.85, 3,981.38 and 2,609.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,653.85 : 3,981.38 = 2,609.78 : x
2. Step 2: Convert to fraction form
   2,653.85/3,981.38 = 2,609.78/x
3. Step 3: Cross multiply
   2,653.85x = 3,981.38 × 2,609.78
4. Step 4: Simplify right side
   2,653.85x = 10,390,492.94
5. Step 5: Solve for x
   x = 10,390,492.94/2,653.85
6. Step 6: Final answer
   x = 3,915.26