Finding the Fourth Proportional to 2,113.56, 3,170.88 and 960.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.56 : 3,170.88 = 960.12 : x
2. Step 2: Convert to fraction form
   2,113.56/3,170.88 = 960.12/x
3. Step 3: Cross multiply
   2,113.56x = 3,170.88 × 960.12
4. Step 4: Simplify right side
   2,113.56x = 3,044,425.31
5. Step 5: Solve for x
   x = 3,044,425.31/2,113.56
6. Step 6: Final answer
   x = 1,440.43