Finding the Fourth Proportional to 3,897.42, 5,379.72 and 3,102.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,897.42 : 5,379.72 = 3,102.20 : x
2. Step 2: Convert to fraction form
   3,897.42/5,379.72 = 3,102.20/x
3. Step 3: Cross multiply
   3,897.42x = 5,379.72 × 3,102.20
4. Step 4: Simplify right side
   3,897.42x = 16,688,949.03
5. Step 5: Solve for x
   x = 16,688,949.03/3,897.42
6. Step 6: Final answer
   x = 4,282.05