Finding the Fourth Proportional to 6,139.80, 8,472.87 and 3,622.05

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.80 : 8,472.87 = 3,622.05 : x
2. Step 2: Convert to fraction form
   6,139.80/8,472.87 = 3,622.05/x
3. Step 3: Cross multiply
   6,139.80x = 8,472.87 × 3,622.05
4. Step 4: Simplify right side
   6,139.80x = 30,689,158.78
5. Step 5: Solve for x
   x = 30,689,158.78/6,139.80
6. Step 6: Final answer
   x = 4,998.40