Finding the Fourth Proportional to 2,688.87, 3,709.72 and 1,679.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,688.87 : 3,709.72 = 1,679.89 : x
2. Step 2: Convert to fraction form
   2,688.87/3,709.72 = 1,679.89/x
3. Step 3: Cross multiply
   2,688.87x = 3,709.72 × 1,679.89
4. Step 4: Simplify right side
   2,688.87x = 6,231,926.61
5. Step 5: Solve for x
   x = 6,231,926.61/2,688.87
6. Step 6: Final answer
   x = 2,317.67