Finding the Fourth Proportional to 3,920.10, 5,411.28 and 2,347.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920.10 : 5,411.28 = 2,347.89 : x
2. Step 2: Convert to fraction form
   3,920.10/5,411.28 = 2,347.89/x
3. Step 3: Cross multiply
   3,920.10x = 5,411.28 × 2,347.89
4. Step 4: Simplify right side
   3,920.10x = 12,705,090.20
5. Step 5: Solve for x
   x = 12,705,090.20/3,920.10
6. Step 6: Final answer
   x = 3,241.01