Finding the Fourth Proportional to 2,139.65, 2,953.37 and 1,353.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.65 : 2,953.37 = 1,353.95 : x
2. Step 2: Convert to fraction form
   2,139.65/2,953.37 = 1,353.95/x
3. Step 3: Cross multiply
   2,139.65x = 2,953.37 × 1,353.95
4. Step 4: Simplify right side
   2,139.65x = 3,998,708.54
5. Step 5: Solve for x
   x = 3,998,708.54/2,139.65
6. Step 6: Final answer
   x = 1,868.86