Finding the Fourth Proportional to 2,168.89, 3,253.74 and 688.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.89 : 3,253.74 = 688.05 : x
2. Step 2: Convert to fraction form
   2,168.89/3,253.74 = 688.05/x
3. Step 3: Cross multiply
   2,168.89x = 3,253.74 × 688.05
4. Step 4: Simplify right side
   2,168.89x = 2,238,737.53
5. Step 5: Solve for x
   x = 2,238,737.53/2,168.89
6. Step 6: Final answer
   x = 1,032.20