Finding the Fourth Proportional to 2,191.52, 3,286.88 and 958.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.52 : 3,286.88 = 958.70 : x
2. Step 2: Convert to fraction form
   2,191.52/3,286.88 = 958.70/x
3. Step 3: Cross multiply
   2,191.52x = 3,286.88 × 958.70
4. Step 4: Simplify right side
   2,191.52x = 3,151,138.87
5. Step 5: Solve for x
   x = 3,151,138.87/2,191.52
6. Step 6: Final answer
   x = 1,437.88