Finding the Fourth Proportional to 2,191.39, 3,283.98 and 956.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.39 : 3,283.98 = 956.21 : x
2. Step 2: Convert to fraction form
   2,191.39/3,283.98 = 956.21/x
3. Step 3: Cross multiply
   2,191.39x = 3,283.98 × 956.21
4. Step 4: Simplify right side
   2,191.39x = 3,140,154.51
5. Step 5: Solve for x
   x = 3,140,154.51/2,191.39
6. Step 6: Final answer
   x = 1,432.95