Finding the Fourth Proportional to 3,941.34, 5,431.54 and 2,820.32

Step by Step Solution

1. Step 1: Write the proportion equation
   3,941.34 : 5,431.54 = 2,820.32 : x
2. Step 2: Convert to fraction form
   3,941.34/5,431.54 = 2,820.32/x
3. Step 3: Cross multiply
   3,941.34x = 5,431.54 × 2,820.32
4. Step 4: Simplify right side
   3,941.34x = 15,318,680.89
5. Step 5: Solve for x
   x = 15,318,680.89/3,941.34
6. Step 6: Final answer
   x = 3,886.67