Finding the Fourth Proportional to 2,128.13, 3,189.49 and 956.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.13 : 3,189.49 = 956.88 : x
2. Step 2: Convert to fraction form
   2,128.13/3,189.49 = 956.88/x
3. Step 3: Cross multiply
   2,128.13x = 3,189.49 × 956.88
4. Step 4: Simplify right side
   2,128.13x = 3,051,952.81
5. Step 5: Solve for x
   x = 3,051,952.81/2,128.13
6. Step 6: Final answer
   x = 1,434.10