Finding the Fourth Proportional to 3,941.10, 5,403.42 and 3,870.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,941.10 : 5,403.42 = 3,870.86 : x
2. Step 2: Convert to fraction form
   3,941.10/5,403.42 = 3,870.86/x
3. Step 3: Cross multiply
   3,941.10x = 5,403.42 × 3,870.86
4. Step 4: Simplify right side
   3,941.10x = 20,915,855.32
5. Step 5: Solve for x
   x = 20,915,855.32/3,941.10
6. Step 6: Final answer
   x = 5,307.11