Finding the Fourth Proportional to 2,690.72, 4,036.89 and 959.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,690.72 : 4,036.89 = 959.12 : x
2. Step 2: Convert to fraction form
   2,690.72/4,036.89 = 959.12/x
3. Step 3: Cross multiply
   2,690.72x = 4,036.89 × 959.12
4. Step 4: Simplify right side
   2,690.72x = 3,871,861.94
5. Step 5: Solve for x
   x = 3,871,861.94/2,690.72
6. Step 6: Final answer
   x = 1,438.97