Finding the Fourth Proportional to 9,990.54, 13,786.47 and 5,738.67

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.54 : 13,786.47 = 5,738.67 : x
2. Step 2: Convert to fraction form
   9,990.54/13,786.47 = 5,738.67/x
3. Step 3: Cross multiply
   9,990.54x = 13,786.47 × 5,738.67
4. Step 4: Simplify right side
   9,990.54x = 79,116,001.79
5. Step 5: Solve for x
   x = 79,116,001.79/9,990.54
6. Step 6: Final answer
   x = 7,919.09