Finding the Fourth Proportional to 3,938.42, 5,429.58 and 2,817.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,938.42 : 5,429.58 = 2,817.42 : x
2. Step 2: Convert to fraction form
   3,938.42/5,429.58 = 2,817.42/x
3. Step 3: Cross multiply
   3,938.42x = 5,429.58 × 2,817.42
4. Step 4: Simplify right side
   3,938.42x = 15,297,407.28
5. Step 5: Solve for x
   x = 15,297,407.28/3,938.42
6. Step 6: Final answer
   x = 3,884.15