Finding the Fourth Proportional to 3,940.26, 5,402.33 and 3,870.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940.26 : 5,402.33 = 3,870.06 : x
2. Step 2: Convert to fraction form
   3,940.26/5,402.33 = 3,870.06/x
3. Step 3: Cross multiply
   3,940.26x = 5,402.33 × 3,870.06
4. Step 4: Simplify right side
   3,940.26x = 20,907,341.24
5. Step 5: Solve for x
   x = 20,907,341.24/3,940.26
6. Step 6: Final answer
   x = 5,306.08