Finding the Fourth Proportional to 9,986.37, 13,781.82 and 5,738.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,986.37 : 13,781.82 = 5,738.79 : x
2. Step 2: Convert to fraction form
   9,986.37/13,781.82 = 5,738.79/x
3. Step 3: Cross multiply
   9,986.37x = 13,781.82 × 5,738.79
4. Step 4: Simplify right side
   9,986.37x = 79,090,970.80
5. Step 5: Solve for x
   x = 79,090,970.80/9,986.37
6. Step 6: Final answer
   x = 7,919.89