Finding the Fourth Proportional to 2,128.39, 3,190.86 and 957.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.39 : 3,190.86 = 957.79 : x
2. Step 2: Convert to fraction form
   2,128.39/3,190.86 = 957.79/x
3. Step 3: Cross multiply
   2,128.39x = 3,190.86 × 957.79
4. Step 4: Simplify right side
   2,128.39x = 3,056,177.79
5. Step 5: Solve for x
   x = 3,056,177.79/2,128.39
6. Step 6: Final answer
   x = 1,435.91