Finding the Fourth Proportional to 2,139.09, 2,951.33 and 1,287.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.09 : 2,951.33 = 1,287.96 : x
2. Step 2: Convert to fraction form
   2,139.09/2,951.33 = 1,287.96/x
3. Step 3: Cross multiply
   2,139.09x = 2,951.33 × 1,287.96
4. Step 4: Simplify right side
   2,139.09x = 3,801,188.55
5. Step 5: Solve for x
   x = 3,801,188.55/2,139.09
6. Step 6: Final answer
   x = 1,777.01