Finding the Fourth Proportional to 3,847.31, 5,309.28 and 2,168.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,847.31 : 5,309.28 = 2,168.72 : x
2. Step 2: Convert to fraction form
   3,847.31/5,309.28 = 2,168.72/x
3. Step 3: Cross multiply
   3,847.31x = 5,309.28 × 2,168.72
4. Step 4: Simplify right side
   3,847.31x = 11,514,315.18
5. Step 5: Solve for x
   x = 11,514,315.18/3,847.31
6. Step 6: Final answer
   x = 2,992.83