Finding the Fourth Proportional to 2,139.92, 3,208.49 and 1,407.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.92 : 3,208.49 = 1,407.27 : x
2. Step 2: Convert to fraction form
   2,139.92/3,208.49 = 1,407.27/x
3. Step 3: Cross multiply
   2,139.92x = 3,208.49 × 1,407.27
4. Step 4: Simplify right side
   2,139.92x = 4,515,208.20
5. Step 5: Solve for x
   x = 4,515,208.20/2,139.92
6. Step 6: Final answer
   x = 2,109.99