Finding the Fourth Proportional to 9,939.74, 13,716.81 and 5,690.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,939.74 : 13,716.81 = 5,690.79 : x
2. Step 2: Convert to fraction form
   9,939.74/13,716.81 = 5,690.79/x
3. Step 3: Cross multiply
   9,939.74x = 13,716.81 × 5,690.79
4. Step 4: Simplify right side
   9,939.74x = 78,059,485.18
5. Step 5: Solve for x
   x = 78,059,485.18/9,939.74
6. Step 6: Final answer
   x = 7,853.28