Finding the Fourth Proportional to 5,111.12, 7,658.86 and 3,439.05

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.12 : 7,658.86 = 3,439.05 : x
2. Step 2: Convert to fraction form
   5,111.12/7,658.86 = 3,439.05/x
3. Step 3: Cross multiply
   5,111.12x = 7,658.86 × 3,439.05
4. Step 4: Simplify right side
   5,111.12x = 26,339,226.90
5. Step 5: Solve for x
   x = 26,339,226.90/5,111.12
6. Step 6: Final answer
   x = 5,153.32