Finding the Fourth Proportional to 2,124.50, 3,185.55 and 1,688.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,124.50 : 3,185.55 = 1,688.54 : x
2. Step 2: Convert to fraction form
   2,124.50/3,185.55 = 1,688.54/x
3. Step 3: Cross multiply
   2,124.50x = 3,185.55 × 1,688.54
4. Step 4: Simplify right side
   2,124.50x = 5,378,912.67
5. Step 5: Solve for x
   x = 5,378,912.67/2,124.50
6. Step 6: Final answer
   x = 2,531.85