Finding the Fourth Proportional to 2,128.05, 3,189.80 and 956.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.05 : 3,189.80 = 956.46 : x
2. Step 2: Convert to fraction form
   2,128.05/3,189.80 = 956.46/x
3. Step 3: Cross multiply
   2,128.05x = 3,189.80 × 956.46
4. Step 4: Simplify right side
   2,128.05x = 3,050,911.33
5. Step 5: Solve for x
   x = 3,050,911.33/2,128.05
6. Step 6: Final answer
   x = 1,433.67