Finding the Fourth Proportional to 3,411.30, 5,118.15 and 3,291.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,411.30 : 5,118.15 = 3,291.30 : x
2. Step 2: Convert to fraction form
   3,411.30/5,118.15 = 3,291.30/x
3. Step 3: Cross multiply
   3,411.30x = 5,118.15 × 3,291.30
4. Step 4: Simplify right side
   3,411.30x = 16,845,367.10
5. Step 5: Solve for x
   x = 16,845,367.10/3,411.30
6. Step 6: Final answer
   x = 4,938.11