Finding the Fourth Proportional to 3,708.18, 5,561.78 and 1,399.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,708.18 : 5,561.78 = 1,399.38 : x
2. Step 2: Convert to fraction form
   3,708.18/5,561.78 = 1,399.38/x
3. Step 3: Cross multiply
   3,708.18x = 5,561.78 × 1,399.38
4. Step 4: Simplify right side
   3,708.18x = 7,783,043.70
5. Step 5: Solve for x
   x = 7,783,043.70/3,708.18
6. Step 6: Final answer
   x = 2,098.89