Finding the Fourth Proportional to 2,153.57, 3,222.66 and 1,688.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.57 : 3,222.66 = 1,688.15 : x
2. Step 2: Convert to fraction form
   2,153.57/3,222.66 = 1,688.15/x
3. Step 3: Cross multiply
   2,153.57x = 3,222.66 × 1,688.15
4. Step 4: Simplify right side
   2,153.57x = 5,440,333.48
5. Step 5: Solve for x
   x = 5,440,333.48/2,153.57
6. Step 6: Final answer
   x = 2,526.19