Finding the Fourth Proportional to 6,139.20, 8,472.78 and 4,153.80

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.20 : 8,472.78 = 4,153.80 : x
2. Step 2: Convert to fraction form
   6,139.20/8,472.78 = 4,153.80/x
3. Step 3: Cross multiply
   6,139.20x = 8,472.78 × 4,153.80
4. Step 4: Simplify right side
   6,139.20x = 35,194,233.56
5. Step 5: Solve for x
   x = 35,194,233.56/6,139.20
6. Step 6: Final answer
   x = 5,732.71