Finding the Fourth Proportional to 7,128.78, 9,833.04 and 4,294.20

Step by Step Solution

1. Step 1: Write the proportion equation
   7,128.78 : 9,833.04 = 4,294.20 : x
2. Step 2: Convert to fraction form
   7,128.78/9,833.04 = 4,294.20/x
3. Step 3: Cross multiply
   7,128.78x = 9,833.04 × 4,294.20
4. Step 4: Simplify right side
   7,128.78x = 42,225,040.37
5. Step 5: Solve for x
   x = 42,225,040.37/7,128.78
6. Step 6: Final answer
   x = 5,923.18