Finding the Fourth Proportional to 2,191.25, 3,287.25 and 958.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.25 : 3,287.25 = 958.63 : x
2. Step 2: Convert to fraction form
   2,191.25/3,287.25 = 958.63/x
3. Step 3: Cross multiply
   2,191.25x = 3,287.25 × 958.63
4. Step 4: Simplify right side
   2,191.25x = 3,151,251.67
5. Step 5: Solve for x
   x = 3,151,251.67/2,191.25
6. Step 6: Final answer
   x = 1,438.11