Finding the Fourth Proportional to 3,086, 4,258.72 and 1,688.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,086 : 4,258.72 = 1,688.72 : x
2. Step 2: Convert to fraction form
   3,086/4,258.72 = 1,688.72/x
3. Step 3: Cross multiply
   3,086x = 4,258.72 × 1,688.72
4. Step 4: Simplify right side
   3,086x = 7,191,785.64
5. Step 5: Solve for x
   x = 7,191,785.64/3,086
6. Step 6: Final answer
   x = 2,330.46