Finding the Fourth Proportional to 2,635.89, 3,953.52 and 688.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,635.89 : 3,953.52 = 688.25 : x
2. Step 2: Convert to fraction form
   2,635.89/3,953.52 = 688.25/x
3. Step 3: Cross multiply
   2,635.89x = 3,953.52 × 688.25
4. Step 4: Simplify right side
   2,635.89x = 2,721,010.14
5. Step 5: Solve for x
   x = 2,721,010.14/2,635.89
6. Step 6: Final answer
   x = 1,032.29