Finding the Fourth Proportional to 7,128.49, 9,837.33 and 3,984.69

Step by Step Solution

1. Step 1: Write the proportion equation
   7,128.49 : 9,837.33 = 3,984.69 : x
2. Step 2: Convert to fraction form
   7,128.49/9,837.33 = 3,984.69/x
3. Step 3: Cross multiply
   7,128.49x = 9,837.33 × 3,984.69
4. Step 4: Simplify right side
   7,128.49x = 39,198,710.48
5. Step 5: Solve for x
   x = 39,198,710.48/7,128.49
6. Step 6: Final answer
   x = 5,498.88