Finding the Fourth Proportional to 2,600.73, 3,901.23 and 1,139.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,600.73 : 3,901.23 = 1,139.90 : x
2. Step 2: Convert to fraction form
   2,600.73/3,901.23 = 1,139.90/x
3. Step 3: Cross multiply
   2,600.73x = 3,901.23 × 1,139.90
4. Step 4: Simplify right side
   2,600.73x = 4,446,992.57
5. Step 5: Solve for x
   x = 4,446,992.57/2,600.73
6. Step 6: Final answer
   x = 1,709.90