Finding the Fourth Proportional to 6,139.55, 8,472.18 and 3,621.54

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.55 : 8,472.18 = 3,621.54 : x
2. Step 2: Convert to fraction form
   6,139.55/8,472.18 = 3,621.54/x
3. Step 3: Cross multiply
   6,139.55x = 8,472.18 × 3,621.54
4. Step 4: Simplify right side
   6,139.55x = 30,682,284.61
5. Step 5: Solve for x
   x = 30,682,284.61/6,139.55
6. Step 6: Final answer
   x = 4,997.48