Finding the Fourth Proportional to 2,168.15, 3,251.25 and 781.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.15 : 3,251.25 = 781.52 : x
2. Step 2: Convert to fraction form
   2,168.15/3,251.25 = 781.52/x
3. Step 3: Cross multiply
   2,168.15x = 3,251.25 × 781.52
4. Step 4: Simplify right side
   2,168.15x = 2,540,900.64
5. Step 5: Solve for x
   x = 2,540,900.64/2,168.15
6. Step 6: Final answer
   x = 1,171.92