Finding the Fourth Proportional to 2,698.77, 4,047.82 and 1,139.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,698.77 : 4,047.82 = 1,139.40 : x
2. Step 2: Convert to fraction form
   2,698.77/4,047.82 = 1,139.40/x
3. Step 3: Cross multiply
   2,698.77x = 4,047.82 × 1,139.40
4. Step 4: Simplify right side
   2,698.77x = 4,612,086.11
5. Step 5: Solve for x
   x = 4,612,086.11/2,698.77
6. Step 6: Final answer
   x = 1,708.96