Finding the Fourth Proportional to 2,783.67, 4,173.67 and 1,139.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,783.67 : 4,173.67 = 1,139.77 : x
2. Step 2: Convert to fraction form
   2,783.67/4,173.67 = 1,139.77/x
3. Step 3: Cross multiply
   2,783.67x = 4,173.67 × 1,139.77
4. Step 4: Simplify right side
   2,783.67x = 4,757,023.86
5. Step 5: Solve for x
   x = 4,757,023.86/2,783.67
6. Step 6: Final answer
   x = 1,708.90