Finding the Fourth Proportional to 1,698.78, 2,344.17 and 1,139.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,698.78 : 2,344.17 = 1,139.15 : x
2. Step 2: Convert to fraction form
   1,698.78/2,344.17 = 1,139.15/x
3. Step 3: Cross multiply
   1,698.78x = 2,344.17 × 1,139.15
4. Step 4: Simplify right side
   1,698.78x = 2,670,371.39
5. Step 5: Solve for x
   x = 2,670,371.39/1,698.78
6. Step 6: Final answer
   x = 1,571.93