Finding the Fourth Proportional to 6,139.89, 8,472.62 and 3,621.87

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.89 : 8,472.62 = 3,621.87 : x
2. Step 2: Convert to fraction form
   6,139.89/8,472.62 = 3,621.87/x
3. Step 3: Cross multiply
   6,139.89x = 8,472.62 × 3,621.87
4. Step 4: Simplify right side
   6,139.89x = 30,686,710.09
5. Step 5: Solve for x
   x = 30,686,710.09/6,139.89
6. Step 6: Final answer
   x = 4,997.93