Finding the Fourth Proportional to 2,571.84, 3,546.72 and 1,688.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,571.84 : 3,546.72 = 1,688.40 : x
2. Step 2: Convert to fraction form
   2,571.84/3,546.72 = 1,688.40/x
3. Step 3: Cross multiply
   2,571.84x = 3,546.72 × 1,688.40
4. Step 4: Simplify right side
   2,571.84x = 5,988,282.05
5. Step 5: Solve for x
   x = 5,988,282.05/2,571.84
6. Step 6: Final answer
   x = 2,328.40