Finding the Fourth Proportional to 3,903.17, 5,423.70 and 3,863.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,903.17 : 5,423.70 = 3,863.21 : x
2. Step 2: Convert to fraction form
   3,903.17/5,423.70 = 3,863.21/x
3. Step 3: Cross multiply
   3,903.17x = 5,423.70 × 3,863.21
4. Step 4: Simplify right side
   3,903.17x = 20,952,879.45
5. Step 5: Solve for x
   x = 20,952,879.45/3,903.17
6. Step 6: Final answer
   x = 5,368.18