Finding the Fourth Proportional to 6,123.40, 8,449.54 and 4,138.28

Step by Step Solution

1. Step 1: Write the proportion equation
   6,123.40 : 8,449.54 = 4,138.28 : x
2. Step 2: Convert to fraction form
   6,123.40/8,449.54 = 4,138.28/x
3. Step 3: Cross multiply
   6,123.40x = 8,449.54 × 4,138.28
4. Step 4: Simplify right side
   6,123.40x = 34,966,562.39
5. Step 5: Solve for x
   x = 34,966,562.39/6,123.40
6. Step 6: Final answer
   x = 5,710.32