Finding the Fourth Proportional to 2,188.91, 3,281.31 and 955.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.91 : 3,281.31 = 955.31 : x
2. Step 2: Convert to fraction form
   2,188.91/3,281.31 = 955.31/x
3. Step 3: Cross multiply
   2,188.91x = 3,281.31 × 955.31
4. Step 4: Simplify right side
   2,188.91x = 3,134,651.85
5. Step 5: Solve for x
   x = 3,134,651.85/2,188.91
6. Step 6: Final answer
   x = 1,432.06