Finding the Fourth Proportional to 2,188.82, 3,282.91 and 939.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.82 : 3,282.91 = 939.91 : x
2. Step 2: Convert to fraction form
   2,188.82/3,282.91 = 939.91/x
3. Step 3: Cross multiply
   2,188.82x = 3,282.91 × 939.91
4. Step 4: Simplify right side
   2,188.82x = 3,085,639.94
5. Step 5: Solve for x
   x = 3,085,639.94/2,188.82
6. Step 6: Final answer
   x = 1,409.73