Finding the Fourth Proportional to 2,688.52, 4,003.25 and 2,659.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,688.52 : 4,003.25 = 2,659.12 : x
2. Step 2: Convert to fraction form
   2,688.52/4,003.25 = 2,659.12/x
3. Step 3: Cross multiply
   2,688.52x = 4,003.25 × 2,659.12
4. Step 4: Simplify right side
   2,688.52x = 10,645,122.14
5. Step 5: Solve for x
   x = 10,645,122.14/2,688.52
6. Step 6: Final answer
   x = 3,959.47