Finding the Fourth Proportional to 2,139.40, 2,950.79 and 1,352.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.40 : 2,950.79 = 1,352.69 : x
2. Step 2: Convert to fraction form
   2,139.40/2,950.79 = 1,352.69/x
3. Step 3: Cross multiply
   2,139.40x = 2,950.79 × 1,352.69
4. Step 4: Simplify right side
   2,139.40x = 3,991,500.13
5. Step 5: Solve for x
   x = 3,991,500.13/2,139.40
6. Step 6: Final answer
   x = 1,865.71