Finding the Fourth Proportional to 2,783.10, 4,174.56 and 1,139.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,783.10 : 4,174.56 = 1,139.22 : x
2. Step 2: Convert to fraction form
   2,783.10/4,174.56 = 1,139.22/x
3. Step 3: Cross multiply
   2,783.10x = 4,174.56 × 1,139.22
4. Step 4: Simplify right side
   2,783.10x = 4,755,742.24
5. Step 5: Solve for x
   x = 4,755,742.24/2,783.10
6. Step 6: Final answer
   x = 1,708.79