Finding the Fourth Proportional to 5,167.09, 7,128.98 and 2,928.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,167.09 : 7,128.98 = 2,928.15 : x
2. Step 2: Convert to fraction form
   5,167.09/7,128.98 = 2,928.15/x
3. Step 3: Cross multiply
   5,167.09x = 7,128.98 × 2,928.15
4. Step 4: Simplify right side
   5,167.09x = 20,874,719.13
5. Step 5: Solve for x
   x = 20,874,719.13/5,167.09
6. Step 6: Final answer
   x = 4,039.94