Finding the Fourth Proportional to 3,511.72, 5,271.37 and 3,124.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,511.72 : 5,271.37 = 3,124.20 : x
2. Step 2: Convert to fraction form
   3,511.72/5,271.37 = 3,124.20/x
3. Step 3: Cross multiply
   3,511.72x = 5,271.37 × 3,124.20
4. Step 4: Simplify right side
   3,511.72x = 16,468,814.15
5. Step 5: Solve for x
   x = 16,468,814.15/3,511.72
6. Step 6: Final answer
   x = 4,689.67