Finding the Fourth Proportional to 1,426.33, 2,139.49 and 1,139.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.33 : 2,139.49 = 1,139.59 : x
2. Step 2: Convert to fraction form
   1,426.33/2,139.49 = 1,139.59/x
3. Step 3: Cross multiply
   1,426.33x = 2,139.49 × 1,139.59
4. Step 4: Simplify right side
   1,426.33x = 2,438,141.41
5. Step 5: Solve for x
   x = 2,438,141.41/1,426.33
6. Step 6: Final answer
   x = 1,709.38