Finding the Fourth Proportional to 6,139.38, 8,472.12 and 3,621.60

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.38 : 8,472.12 = 3,621.60 : x
2. Step 2: Convert to fraction form
   6,139.38/8,472.12 = 3,621.60/x
3. Step 3: Cross multiply
   6,139.38x = 8,472.12 × 3,621.60
4. Step 4: Simplify right side
   6,139.38x = 30,682,629.79
5. Step 5: Solve for x
   x = 30,682,629.79/6,139.38
6. Step 6: Final answer
   x = 4,997.68