Finding the Fourth Proportional to 2,806.25, 3,872.71 and 1,686.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,806.25 : 3,872.71 = 1,686.72 : x
2. Step 2: Convert to fraction form
   2,806.25/3,872.71 = 1,686.72/x
3. Step 3: Cross multiply
   2,806.25x = 3,872.71 × 1,686.72
4. Step 4: Simplify right side
   2,806.25x = 6,532,194.04
5. Step 5: Solve for x
   x = 6,532,194.04/2,806.25
6. Step 6: Final answer
   x = 2,327.73