Finding the Fourth Proportional to 3,411.72, 5,128.92 and 2,799.97

Step by Step Solution

1. Step 1: Write the proportion equation
   3,411.72 : 5,128.92 = 2,799.97 : x
2. Step 2: Convert to fraction form
   3,411.72/5,128.92 = 2,799.97/x
3. Step 3: Cross multiply
   3,411.72x = 5,128.92 × 2,799.97
4. Step 4: Simplify right side
   3,411.72x = 14,360,809.31
5. Step 5: Solve for x
   x = 14,360,809.31/3,411.72
6. Step 6: Final answer
   x = 4,209.26