Finding the Fourth Proportional to 2,635.89, 3,954.07 and 688.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,635.89 : 3,954.07 = 688.09 : x
2. Step 2: Convert to fraction form
   2,635.89/3,954.07 = 688.09/x
3. Step 3: Cross multiply
   2,635.89x = 3,954.07 × 688.09
4. Step 4: Simplify right side
   2,635.89x = 2,720,756.03
5. Step 5: Solve for x
   x = 2,720,756.03/2,635.89
6. Step 6: Final answer
   x = 1,032.20