Finding the Fourth Proportional to 7,042.28, 9,719.39 and 4,390.54

Step by Step Solution

1. Step 1: Write the proportion equation
   7,042.28 : 9,719.39 = 4,390.54 : x
2. Step 2: Convert to fraction form
   7,042.28/9,719.39 = 4,390.54/x
3. Step 3: Cross multiply
   7,042.28x = 9,719.39 × 4,390.54
4. Step 4: Simplify right side
   7,042.28x = 42,673,357.25
5. Step 5: Solve for x
   x = 42,673,357.25/7,042.28
6. Step 6: Final answer
   x = 6,059.60