Finding the Fourth Proportional to 2,192.21, 3,288.89 and 959.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,192.21 : 3,288.89 = 959.87 : x
2. Step 2: Convert to fraction form
   2,192.21/3,288.89 = 959.87/x
3. Step 3: Cross multiply
   2,192.21x = 3,288.89 × 959.87
4. Step 4: Simplify right side
   2,192.21x = 3,156,892.80
5. Step 5: Solve for x
   x = 3,156,892.80/2,192.21
6. Step 6: Final answer
   x = 1,440.05