Finding the Fourth Proportional to 2,139.09, 3,203.91 and 1,314.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.09 : 3,203.91 = 1,314.78 : x
2. Step 2: Convert to fraction form
   2,139.09/3,203.91 = 1,314.78/x
3. Step 3: Cross multiply
   2,139.09x = 3,203.91 × 1,314.78
4. Step 4: Simplify right side
   2,139.09x = 4,212,436.79
5. Step 5: Solve for x
   x = 4,212,436.79/2,139.09
6. Step 6: Final answer
   x = 1,969.27