Finding the Fourth Proportional to 2,139.68, 2,951.39 and 1,384.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.68 : 2,951.39 = 1,384.44 : x
2. Step 2: Convert to fraction form
   2,139.68/2,951.39 = 1,384.44/x
3. Step 3: Cross multiply
   2,139.68x = 2,951.39 × 1,384.44
4. Step 4: Simplify right side
   2,139.68x = 4,086,015.45
5. Step 5: Solve for x
   x = 4,086,015.45/2,139.68
6. Step 6: Final answer
   x = 1,909.64