Finding the Fourth Proportional to 9,939.98, 13,717.48 and 5,691.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,939.98 : 13,717.48 = 5,691.05 : x
2. Step 2: Convert to fraction form
   9,939.98/13,717.48 = 5,691.05/x
3. Step 3: Cross multiply
   9,939.98x = 13,717.48 × 5,691.05
4. Step 4: Simplify right side
   9,939.98x = 78,066,884.62
5. Step 5: Solve for x
   x = 78,066,884.62/9,939.98
6. Step 6: Final answer
   x = 7,853.83